Vertigo Theme for Tumblr
Jakob’s orange crocs may have stolen my thunder here a little, but if you’re still reading, I made a Tumblr theme called Vertigo that’s also orange. Luckily for you it supports custom colours, so you can change the orange to something else. I’ve released it under Creative Commons so you’re free to make derivative works, with some provisos. If you use it, drop me a line and let me know.
Edit: Wow, that was quick! Also: fixed a minor cut-and-paste issue that resulted in an error with the permalink on the little “atom” icon, grab the theme file again if it bothers you.