I love coming across new things, especially fun ones. I found this group over on DeviantArt called "Design A Character", link ,and thought "this should be good, fun practice". The first challenge in progress since joining the group (earlier today) is called "Drop In". You take a picture and add a character that would seem to fit.
I went to a website where I knew there would be interesting pictures, link , picked the first picture of interest I came across, and this is what my brain produced. Fun, and not overly time consuming.