Cherrichiodo.com has released a pretty cool free Valentines Day theme called Be My Valentine. The theme has a snazzy purple background which only those of the female persuasion could truly love. Cherri has kindly offered OTA downloads on all of the themes on the site (Over 20+ from my last count). They are also available for practically every device out there now including all the variants of the 8100, 8300, 8700, & 8800 series.
You will find a ton of other themes on the www.Cherrichiodo.com website. Many of them free and a few premium paid themes for the BlackBerry Pearl only.
Another cool series of themes by Cherri are the Skelanimal themes that you see below. You can find them also on the download links above.