For writer's block they reckon sitting down with pen and paper and just writing everything that comes into your head, even if it's just like "I think we've run out of milk, maybe I should go get some more. I like frogs. i ate a mango today", the idea is to not censor yourself, and to just keep going for a set amount of time. Freewriting. Maybe you should try freearting!
I did that once with paint. I hate wasting precious canvases but I was so depressed I grabbed one and just put lines on it and coloured bits in and painted shapes and a few words, as the whim took me. It didn't cure my depression but it was very therapeutic. :p alternatively you could just use some paper.
but yeah, freewriting helps loosen up a writer, and I think there's definitely such a thing as artist's block.
If you like drawing, you could randomly pick out a few photos, maybe from deviantart (are you aware of the Stock and Resources section - photos you can use for your art? they're awesomely handy) and practise drawing them (I'm thinking of people but that's only because that's what I usually draw).
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