If you want free, including tips on BB theme design, google "blackberry html templates" or similar. The word "widget" refers to the applications one can run in a BB, much like XCode and Cocoa is used for iPhone apps, not HTML. That might have contributed to your search results.
That's the BB widget SDK site which is a reference repository for developers seeking to integrate rich web and standard HTML into the proprietary BB browser. If ya can't find it there, maybe use Google images which have snapshots of web sites as they render through their browser and just capture a few. Hope this helps! If anyone else has any better ideas, go for it!