As Matthew and Blaine pointed out in there recent Forum release...there is a need for new forum themes to be created for existing Geeklog themes. With that said, you can find my little contribution for the Simple Orange theme in the Gplugs file downloads. You can visit my forum on Squatty.com for a live demo.
I encourage users to create and upload additional themes on Squatty.com or on the main geeklog site. In addition, I'm in the process of creating a new section to the Gplus CVS tree for developers to store there work. Feel free to contact me or TomW should you wish to add your code the Gplugs repository.