Nate Weizenbaum made a really useful app in cairo for doodling a while back called Scribble!. It was a lot like nodebox, a sort of graphical equivalent of the read-eval-print-loop. I missed it, so I ported it over to shoes. It uses shoes syntax so it really helps me when I am developing shoes apps. I think it will help you out too, so I have attached it.
Posted to the shoes mailing list by Evan on Feb 18th, 2008
Speak now or forever hold your peace:
August 15, 2008
It opens a window but the scribble button doesn’t do anything.
August 20, 2008
It works for me—you enter your Shoes code in the textbox, and press ‘Scribble!’ and it will eval the textbox and display it in the window.

Um, it doesn’t work for me.