Every designer needs a place for inspiration when handling colors and there are a lot of sites that focus on that (like Kuler from Adobe). One of this kind of sites is also Colrd where you can find a lot of color palettes, gradients or patterns.
On ColRD you can also share your web resources and having a simplistic interface it is possible to filter items by color, popularity and even hue, luminance, etc. Also, besides this, ColRD offers several open source color pickers.
ColRD.com – find and share patterns, gradients or color pallets