Diseases are needed to make full completed creatures.
I wonder how to remake interesting and plausible diseases without attributes.
There is a list of diseases in Morrowind Vanilla:
COMMON:
- Ataxia is a mild common disease affecting the victim's strength and dexterity. Symptoms include generalized pain and muscle stiffness. It may be contracted from slaughterfish (and bears).
- Brown rot is a mild common disease affecting the victim's strength and behavior. Symptoms include necrosis and sleeplessness. It may be contracted from the bonewalker, skeleton, greater bonewalker, or bonelord.
- Chills is an extremely dangerous common disease affecting the victim's mind and coordination. Symptoms include clumsiness and mental confusion. It may be contracted from the bonewalker, skeleton, greater bonewalker, or bonelord.
- Collywobbles is a serious common disease affecting a victim's strength, endurance, and mobility. Symptoms include uncontrollable shaking and chronic weariness. It may be contracted from the fiery shalk.
- Dampworm is a serious common disease affecting a victim's mobility. Symptoms include uncontrollable muscle spasms and twitching. It may be contracted from the nix-hound (not really, MW has not diseased animals with this).
- Droops is a serious common disease that affects a victim's strength. Symptoms include weak and flaccid muscle tissues. It may be contracted from all forms and stages of kwama.
- Greenspore is a serious common disease affecting a victim's behavior. Symptoms include irritability and violent outbursts, and may include mild dementia. It may be contracted from slaughterfish.
- Helljoint is a mild common disease affecting a victim's mobility and dexterity. Symptoms include persistent irritation and inflammation of joints. It may be contracted from the girdle-tailed cliff racer.
- Rattles is a mild common disease affecting a victim's willpower and dexterity. Symptoms include muscle spasms and listlessness. It may be contracted from the nix-hound.(not really, MW has not diseased animals with this).
- Rockjoint is an acute common disease affecting a victim's manual dexterity. Symptoms include painful swelling and immobility of all joints. It may be contracted from the domesticated guar or dusky alit.(not really, MW has not diseased animals with this).
- Rust chancre is a mild common disease affecting a victim's mobility and behavior. Symptoms include swelling and rash, and painful muscle spasms. It may be contracted from the waste rat.
- Serpiginous dementia is a serious common disease affecting the victim's mind and behavior. Symptoms include hallucinations and an itchy and unsightly scaly skin condition resembling snake scales.
- Swamp fever is a mild common disease affecting the victim's strength and behavior. It may be contracted from the mudcrab. The symptoms include high body temperature and delirium, but there are no easily visible signs.
- Witbane is an acute common disease affecting a victim's memory and thought processes. Symptoms include loss of memory and disorientation. It may be contracted from the rat.
- Wither is a mild common disease that affects a victim's strength and endurance. Symptoms include loss of energy and shortness of breath. It may be contracted from dreugh.
- Yellow tick is a mild common disease affecting a victim's strength and mobility. Symptoms include dark, bruise-like swelling, sensitive to touch. It may be contracted from the least kagouti.
BLIGHT:
- Ash-woe is an acute blight disease affecting a victim's will and thought processes. It may be contracted from corprus beasts or other blighted creatures.
- Ash-chancre is an acute blight disease affecting a victim's behavior. It may be contracted from corprus beasts or other blight monsters.
- Black-heart is an acute blight disease affecting a victim's strength and endurance. It may be contracted from corprus beasts or other blight monsters.
- Chanthrax is an acute blight disease affecting a victim's dexterity and mobility. It may be contracted from corprus beasts or other blight monsters.
CORPRUS:
- Corprus is a deadly disease profoundly affecting a victim's mind and body. Symptoms include dementia, violent behavior, and distorted, disfiguring skin growths. It may be contracted from corprus beasts or other blight monsters.
And there is a list of ingredients to heal them:
CURE COMMON:
- Chokeweed
- Daedra Skin
- Gravedust
- Green Lichen
- Muck
- Red Lichen
- Willow Anther
CURE BLIGHT:
- Ash salts
- Scrib Jelly
Main Skyrim diseases are pretty simple and tolerable. They are basically penalties to MP/HP/SP and their regeneration and penalty to skills' efficiency. Diseases in Morrowind must be based on this, but would be really nice to have any additional annoying scripted (chance to drop weapon for example) or visual effects (like blur vision) for them.
Another step forward that's possible to make - to have specific cures for different conditions. In basic/vanilla morrowind there are 7 ingr. for Cure Common Disease and 2 for Cure Blight (that maybe need to be threated as in vanilla). Would be nice to have at least 3 ingr. for each disease threatment, and that is possible only with additional ingredients. Would be nice to have associated saints and gods to heal different diseases.
With additional need to have 'Panacea potion' to heal any disease - that would be need for 16x3 ingr. effects. They can be implemented as ingr-s from new plants (such as made by Vita for Bitter Coast) and as ingredients produced as additional parts of animals (for example eye of scrib or liver of rat) and existing plants (leaf of Black Anther). Some things can be produced as junk of another activity (seeds from edible fruits, and so on).
This thread exist for collection of new ideas and discussion. So be extravert.

It would be interesting if
It would be interesting if the diseases actually effected you in different ways in Skywind. For example, perhaps Swamp Fever makes your perception of the world warped in some way, perhaps you character sees foes all around when they're really calm, or perhaps the screen acts glitched or something.
Certainly more work than "lower strength", but it's something to consider.