You are aware of that other similar sounding website (Picnik), right? You know, the immensely popular online photo editor that was acquired by Google several months ago?
As far as your actual tool: There are many color pickers available online that have many more useful features than you do. I'm not trying to be snarky and I hope you posted here for feedback.
Why would I use your product? What's the use case? What value does it provide that the other dozen or so top color pickers DON'T offer?