I put together a Processing.py / Python Mode cheat sheet for beginners. If that sounds useful, you can grab it here: https://github.com/tabreturn/processing.py-cheat-sheet
I figured a simple 2-pager works best (a single sheet of paper, printed both sides). Once the user outgrows this cheat sheet, the official Python Mode reference is probably more useful than a cheat sheet with several more pages. Add to- or edit as you please.