Deza Egg is a Japanese aftermarket game hardware customiser. So if you're not happy with the 3DS colours Nintendo is offering, Deza Egg can help.
Deza Egg has 60 colours that users can choose from, and users can either send in their 3DS to be painted with prices starting at ¥19,980 ($244) depending on the colours or buy a newly painted unit for ¥44,980 ($550) and up. That price includes the price of the actual 3DS unit.
I like the yellow one!