Here are some ideas.
More skins. - (Or colour you self with patterns if possible)
More battles. - It gets boring after a while- A battle every so will be fun.
Gatherings. - Make it more interresting to the game!
Having more litters.- Having more litters with your mate will be great! other wise ill have to go with another.
More toms.- Of you are a she cat, there is only 2 options if you wanna mate. Duskfall and dust feather. If I stop being mates with one, I will not be able to talk to them. It is quite anoyying.
(Dont take this as hate! They are just ideas, the game is great!!)