Honeybadger, the awesome Tumblr theme.
Honeybadger is a simple, free and responsive Tumblr theme based on the Foundation framework.
Q: What does responsive mean?
A: It means it adapts to the size of a screen.
Q: I'm stuck!
A: Ask for help (http://mehon.tumblr.com/ask)
Q: I want a new feature!
A: Sure. Submit it to our bug tracker.
Q: Is this open source?
A: Yes, this theme is MIT licensed. You can grab the code from well, here.
There are two install methods:
a) Get it from the Theme Garden (better) - go here: http://www.tumblr.com/theme/36524 and press on Install theme and then choose the tumblog where you want to install it.
b) Install it manually - copy/paste the code from the honeybadger.html file, go to http://tumblr.com/customize/yourtumblrusername, press on Edit HTML and then paste the content of the file there. Click on Save and you're done.
Fork this theme, add your stuff and send a pull request.