The rules:
Keep what the person bellow you drew, just add on. Essentially you can just copy and paste it into your program of choice and add on then just post it onto the board once you are finished your contribution.
The Idea is not to have a finished piece by every one but to eventually have a cool piece of art to put on the guild front. You can color or just draw. You can draw figures or just objects.
You don't even have to draw whole objects you can just draw lines connecting to someone else's art!
Here is the starting piece, draw away!:
