I've picked out a theme called Helios which I think is quite fitting. I noticed there were some alternative colour scheme images (not full themes) so I decided to put a bit of work in, making five extra copies of the Theme, putting in the modified images, and then effectively uploading the same theme six times to the web server. I now know I hate uploading themes because of the number of files for each...
If you want to change the theme you see, go to your profile, select "Look and Feel Preferences" from the menu at the left, and click on (change) next to where it says current theme. Unfortunately the preview for Helios is the same for each colour scheme.
For now I'm setting the default to Helios Silver.
ZM