I've been thinking about creating another roleplay. Here are my ideas, I ask please that no one steals them... They are quite obscure.
Idea 1. Space-based
With some map magic, creatures live on a space ship on an alien planet. These creatures have wings and are a custom species. I personally think this one won't work, but it's worth a shot.
Idea 2. Primal Warriors
Warrior cats in the ice age. Clans of cats in snowy biomes have to band together or destroy each other to survive.
Idea 3. Apawcalpyse
An apocalypse ravishes the lands, killing most animals. Only a few cats remain, warrior cats. They need to survive in a harsh abandoned city environment.
Idea 4. City Cats
Warrior cats just in a regular city, multiple clans living amongst twolegs and kittypets.
If you have any more ideas, I'd be more than happy to hear them below!