As you have probably noticed by now, I am not an artist. I would give you full credit if they are made available from my site, or just point people at your site, or maybe both. Anyway, let me know. Making pieces To achieve good control over different shaped pieces, you should create pieces as transparent GIF images. You should also think about the size of the image files that you create.
Large images increase the time needed to load the game.
The more pieces that you use, the slower the game will be when moving pieces around because of the amount of image updating that is occuring in the background. I might do something about this later. Most parameters and parameter names are case sensitive, take care to write these correctly. Pieces are processed in numerical order, this means that pieces with higher numbers will be painted after pieces with lower numbers and will therefore appear on top. You should remember this when designing themes.