Some additional ground rules/advice for making this thing run smoothly.

1) Dont forget, only submit 100 pixels of the RIGHT (as apposed to left) side of the image.

2) Dont include the previous volley in your own. You are only supposed to continue from it. Users may find it easier to start with a 700px wide image, paste the last volley onto the left hand side, and continue it from there, and when they finish, cut the starter-volley out of their own volley.

3) To help other users, and to make things more fun, try and keep the right side of your image fairly clean and simple. Dont make it too hard for someone to continue onto. Try to keep your right side of the image as vector-ish as possible, and avoid making users try to continue your image with a photo or something.

4) Dont be afraid to be adventurous and change the style around. Be crazy and abstract. You may even want to change styles multiple times within your own volley.

5) Finally (and obviously) no offencive content in your volley... nudity, swearing, and strong offence.