I've selected a few minimalist and a couple of "Other" themes you can select from. I like themes that don't stand out for use at work, if you know what I mean.
You can change the them by:
1. Clicking on Profile at the top of the page. 2. Click on the Edit Profile button. 3. Click on the Settings tab. 4. Scroll down to Forum Theme and click on the down arrow to reveal the available themes. 5. Click on the Save Account Settings box at the bottom of the page. 5. Hit the F5 key to refresh the page and see how the new Theme looks. 6. Repeat as necessary.