There is a new theme available for use on the forum. Eventually this theme will become the default theme for the forum but that won't happen until a few kinks get worked out. (Those current kinks are: Missing news at the top of the page which contains the links to other Ehell blogs and main site; ugly read/unread icons; minor changes in some background colors.)
You can change to this new theme by clicking on Profile>Modify Profile>Look and Layout. At the top of this page it says "Current Theme: Change". Click on that and choose which theme you prefer to see for your forum viewing. The Tepid theme does have two color variations.
Once Tepid becomes the new default theme, you will still be able to choose to apply the old, blue theme named Curve.