Oddly enough, writing. I have to admit I very rarely publish my work online and even more infrequently share it with others, but I've never had issues with coming up with an idea and describing it in a set theme. Due to this talent of sorts I would get cocky with essays and similar type projects in school - and very rarely was this cockiness punished, so I suppose I didn't learn my lesson of putting things off until the last minute, haha.

For fun I'll have friends give me a single word and just... build an entire story or scene around it. Helps as a creative outlet, you know?