If you scroll down further in the forum thread list...there's a themes section and then there are breakdowns by BB model number. There are quite a few good ones in there! You might also see ones you like in the sticky thread above for "Post your BB Screen".
Be ware that many free themes I have bought have massive memory leaks... They all are well put together a majority of the time and look very nice with nice animation. I had a friend who had a storm that stayed around 29mb of app memory all the time. She loaded a particular free theme on and played around on it adjusting it to her likings and the next morning she woke up and had 1.7mb left. Now THATS a memory leak...hopefully yours won't behave this way.