Photoshop is a fantastic tool! I always enjoy using it so I like to find little projects that send me back there. Whether it's creating thumbnails for videos, posters for my films, logos or, experimenting with different techniques.
It is also a really good way for me to test out VFX before I make the video version. I can see what I need to do in terms of lighting, the different assets I'll need to film and how long it'll take! Once I'm happy I can then take what I've learnt and create some of these effects in video!