Kuler, the coolest way to create and share color themes. Kuler is a product from Adobe, which is mainly focused to attract design crowd.
The site provides capability to create color palettes and search through color palettes created by others. To put it very simple, it is an users’ submitted database of color themes.
Home page:

To use Kuler we need web browser with Flash player 9 or above as it’s a Flash based site.
You can explore the themes created by others and can filter by Newest, Most Popular, Highest Rated and Random options. You can even search by tags, titles, creators.
One of the unique features of Kuler is Social Networking, wherein color themes are shared to the public to get their feedback and add comments.
Theme creation:
There are two options to create color themes,
1.Create theme from a Color

By using color wheel, we can easily adjust the color. Color values are generated using HSB, RGB, CMYK, LAB, or HEX color models.
2.Create theme from an Image

This is a special feature in Kuler, where color themes are generated from an image. Images can be uploaded via desktop or Flickr. Kuler supports TIFF, JPEG, GIF, PNG, and BMP image formats.
Using the Kuler Extension in Photoshop:
How to open the Kuler Extension:
Go to Window -> Extensions -> Kuler
After selecting the Kuler, a dialogue box will appear with three tabs About, Browse, Create.


About: This tab explains about the Kuler
Browse: This tab allows you to view the list of uploaded and available color themes. It allows to browse by Highest Rated, Most Popular, Newest, Random, Saved and Custom.
Create: This tab allows you to create your own color themes.