I've had it a specific way for a really long time (the way the geekstogo blog looks), but now it appears that it went back to the classic geekstogo look. The only way that I know how to change the theme is to go down to the bottom of the page and click on "Change Theme", but it doesn't have the one that I was used to using. Thanks in advance!
Yes, we did indeed recently upgrade the site. The upgraded software was not compatible with the old themes. It's funny you should mention the current theme looks like the classic, because this is kind of what I had in mind with this latest theme. The best of both the classic, and the recent Geeks to Go theme (there were actually others prior).
I understand change is difficult, but there are currently no plans to reintroduce themes that look like the classic or recent theme. We will offer members options to change colors, and a darker theme.
There's also more at play here. We recently upgraded to the latest version 3. Version 4 is due shortly, and will likely look very different. Again requiring new themes. Creating a custom theme can be very time consuming. Maintaining multiple themes is more difficult. Doing both when they are to be short-lived... Seems foolhardy.
If you have suggestions, or feedback on the Geeks to Go 2014 theme, we'd like to hear them. 
P.S. The blog will be changing to match the forum theme soon.