There's a good assortment of styles in the Jumsoft collection. I personally find the Teddy theme to be a bit twee and Flowered World is too feminine for my taste, but YMMV. My personal faves from the new collection are the sparse and paper-like Simple Info, and the pastel and plastic Business. An installer app is included to make sure that your new themes end up in the proper place on your Mac.
Jumsoft sells each theme for $9.99 or you can buy the entire pack of ten themes at a 30% discount for $69.99. If you're an iWeb fan and want some additional design options, take a look at the new themes.