Cherri Chiodo just released two themes that really impressed me. There is one for the guys and one for the girls. The first, Pink Blossom is a beautiful theme that really catches the eye. The icons are a bit understated for me but they do look nice. The xBerry theme seems to be a rip from the Xbox with a great but again understated icon set. I love the green (my favorite color).
Definitely worth checking out. They are $6.99 each which is on the high end for themes. The themes are available for the 8100, 8300, & 8800 series devices. The 8700 series is also supported BUT YOU MUST HAVE OS 4.2!!!