[tomvb]

Agreed. There are a million area's to focus on, I've focused on getting the site online first as to be able to get the site to grow using feedback like this. So thanks!

The solution itself is indeed difficult, the key is providing information by something other thank color alone. But as you mentioned, you're bound to a single basic shape that can't really differ from the rest.

A clearer color palette might work, but there is no guarantee that it might work for every possible type of colorblindness in every possible situation.

[FreeFull]

You could use black and white patterns, so as long as a person can distinguish contrast, they should be able to differentiate between the pieces.