I've put up a bunch of wallpapers for the 7100 series on my website (240x260 resolution). Many are formatted to look good with the Zen theme. Thought I'd post a link for anyone who's interested. You can browse on your PC, too.
msop.net wallpaper - wap.msop.net
(It's not actually WAP, but simple to type in)
If you have any requests, I'll do my best to get something for ya. All the images were shared online and formatted by myself for the blackberry.
For searching purposes (7100t, 7100i, 7100g, 7105t, 7130c, 7130e, 7130g)