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Adobe Labs has released the API for Kuler, which is a web-based application for creating color themes.
With this API offering, developers can request RSS feeds for the highest rated, most popular, and most recent themes that have been posted to Kuler, and integrate them within their own web sites. However, the API does not allow for commercial use. You'll remember that Kuler is a user-generated community for color themes, specifically to be used for website designs. See initial write up here.