Check out this cool site. Here's an excerpt from the site that explains.
Explore, create and share color themes
Discover Adobe® Kuler™ — the web-hosted application for generating color themes that can inspire any project. No matter what you're creating, with Kuler you can experiment quickly with color variations and browse thousands of themes from the Kuler community.
You don't have to login, create an account or anything else! Just click and play! Enjoy :)