CRC do fancy ones, but they are £45 each. Stuff with flames, dragons etc. on them.
I'd be interested in custom ones, if I could afford them. However, I feel that they would be quite a bit more than standard rotors & my sensible side would say no!
Some of the 'funky' rotors also look as if quite a lot of material has been removed – I wonder what testing they have been through to make sure the rotor doesn't just snap from the spider.