So... I also contribute (well once anyway) to a communal comic called 'Spicy space tales'. It's an ongoing project in which each consequtive page is drawn, inked, coloured and lettered by a single entity, after which another artist takes up the reigns and continues the story, improvising the plot as they go. Much hilarity insues. Especially if like me you are not a good writer.
This is the page I did, took me about 2 days all in, so obviously not a sketch. But I thought it would be nice to post something :)
If you're interested in seeing the whole thing, then it's here.