Have you seen this page? It has some ideas:
Here are two complete PAO systems:
http://jwleaf.org/html/pao-mnemonic-system.html
[archive]
If you are having trouble with certain numbers post them here, and maybe everyone could help find images.
The Ben System has 2704 images:
I added 100 images to that for 2-digit numbers, but haven’t finished the 2,704. I’m getting closer though. My deadline is the end of the month.