You can track the progress on Society6: http://www.society6.com/studio/julianandpat
I'll also be posting images here on my blog as the pieces progress. Here are the first round of drawings!
Pat's start of the b&w piece:

My additions:

My start of the color piece:

(Apparently I have a thing for tangles.)
Can't wait to see what Pat adds next!
Stay tuned for more updates in the future. Get excited!
Oh, and don't forget to follow us on Society6:
http://www.society6.com/PatPerry
http://www.society6.com/juliancallos