Color Lovers is an online repository of seamless patterns and color palettes submitted by users around the world. The assets can sorted by number of views, likes or comments.
They also have dedicated channels for web, print and business to help you quickly pick colors, palettes and patterns that are more suitable for your design project.
And in case you wish to experiment on your own, Color Lovers offers an online pattern generator to help you design seamless patterns with the help of simple editing tools. The patterns may be added to the online gallery for the world to see.