I'm not usually racsist towards kite equipment, but i say...Get a white kite so it gets dirty fast, or a blue one so its hard to see it. I like plane white, black or blue boards because they are usually the hardest to see when you loose your board on the water.
I go for a black full length wetsuite because i like to look like an injured seal being dragged around, to any sharks that may be near me.
My question to you is do you want your appearence to look individual or just like your favourite pro? or do you not care what you look like on the water? - there will always be someone out there with the same colours on a kite or close to yours, so i think its just a matter of personal preference and appearence - some people dont care about colour and they look like a rainbow, some want everything including kite
BLUEso it all matches. I personally like to colour co-ordinate everything else but the kite (eg. board, harness, shorts, shirt, wetsuit, etc) so the kite colour i don't care about.
So in my opinion kite colour doesnt matter so much.

Personall prefence is the key - what ever make you feel good