Animation concept and ideas

So my idea for my animation project is basically a time lapse video of a drawing or set of drawings worked on by me and two of my friends. We'll start by having one of us draw a picture, photographing the progress with a digital camera till we have one complete work then white out or erase all but one part of it and move on to the next artist and have them transform the picture into something new. I haven't decided on the subject matter yet because I want to discuss it with my friends to see what we can come up with. I'm pretty eager to see how this will turn out because it's something I've thought of doing for some time. I looked up a few works by an artist called Blublu (http://www.youtube.com/watch?v=uuGaqLT-gO4) and another named William Kentridge (http://www.youtube.com/watch?v=q1sPLXMg1BQ). Seeing these videos really gave me some ideas toward the direction of where I want my project to go. I'm pretty excited about it, but a little worried about how long it will take. All these in depth projects are really cutting into my laying around time. :)