It's not what you think.
Colourlovers is a website where people submit, rate, review and comment upon...colors. And palettes of said colors!
It sounds a little bizarre, but it's a pretty popular site, and skimming the palettes shows me color combinations that I normally wouldn't have thought of living together nicely (the aforementioned "lover" part of the site name), but once I see them I'm like, "Yeah, I can dig that!"
I could see it being a quick check for a website's color palettes, interfaces, anything else that needs multiple colors loving each other in close proximity.
Check it out!