My boyfriend got me a pair of custom flowlights for Christmas - I'm sharing their awesomeness. Made by Justin Conley, no website but on facebook
and I suspect on here as qwertycoder. (He called them 'modded' but is using cases and boards from flowtoys to build them rather than breaking down standard flowlights).
They're green/white-violet, I'm calling them iris:
Prisna is right when she says that available purple leds don't have a really intense colour, but purple is my favourite colour and purple / green my favourite colour combo and I'm really happy with how they turned out. My camera is fairly basic and doesn't do them justice - the violet is close to the purple in spirit, the green is more like earth than water.
I wanted them to use as a duo with spirit, since I'm not all that into pink and IMO they work very well:
they also look cool as a duo with water:
and as a trio / staff end with water and spirit:
I don't currently have access to a video camera, but when I do I'll put up some vids - they look much better in spin than at rest and went over very well on nye (total fire ban where I was).