Well, this is what I found when I went to "Interior Design by Spinbrush" And apparently, You can design a toothbrush and buy it for free, for non superstars, too.
Although... I think it's only for people who live in the US
So I'm very sorry if it is not available in Your country.
Here is what I saw:
(Click picture to enlarge)
Interesting, what do You think?