I believe there are some people who design corporate/business themes that are really nice, the only thing is that they are usually not free. I've seen a bunch of Mtechnik's themes and they are really awesome. Just browse around until you find something you like. Also, there are a lot of people who offer custom theme design. I myself offer this, but won't be available to work on anything for at least another week and honestly, you would get better work from someone else who has more time.

Anyhow Hope this helps at least a little!

Here's some links to websites I've seen with awesome themes.
http://www.port-all.org
http://www.mtechnik.net/

There are a lot more, these are just the first ones that come to mind. I think both places offer custom design too.