I'm a potter and a botanist, and I've been working on making pots for someof my bonsais. However, my production has outstripped my own demand. I would be happy to work with you to design and create a unique, well-suited pot for you favorite tree. Shape, color, surface treatment, are all variable, as is size up to a maximum.
Check out these random samples, to get a sense:
http://www.etsy.com/shop/bensbonsaipots
Much more is possible.
Ben