BlogStarter is a free barebones starting point with a one-column and two column version. No complex hooks or theme frameworks to learn, just a hollowed out and reorganized version of the default theme with no images and limited style.
The one-column theme has a working dropdown menu across the top.
This is not meant to be a ready to go theme itself, but a great foundation for putting your own style on top of without having to cut out the extra style or images that any ready to go theme would come with.