My very good friend and I are trying this thing we call Style swapping. She gives me a character she draws a lot and visa versa. We then draw that character in our own style. Pretty simple concept, but it's great for when the creative juices just aren't flowing. Of course, you need the artist's full consent.
Here's an example of our first swap. My character Sy FInnigan in her style. I wish I had a link for her work but honestly it's a really long freakin link. So just take my word that she's good.