I've downloaded too many themes.
What I find interesting is the standard practice of putting the blog content messages into such small areas on the sites and leaving so much blank space unused.
Theme builders provide variable width theme with lots of space, you have a sidebar then as you scroll content the sidebar disappears quickly. The blog content still remains where it was, and the sidebar column extends the full length of the page. You have this big worthless space for the sidebar column extending the full page length. - waste of space!
Why don't theme builders use some flash or XHTMl/DHTML horizontal drop down menus that tier/subcategory. Why not have a row of columns across the top of the page with the blog contents below?
I could use some recommendations or links to some themes that utilize space and navigate well. It would be nice to have some color and a few nice graphics.
Two columns of blog contents on a varible width theme would seem to be a better choice, than one column of blog content and wasted space.
It maybe that Blogger don't revere horizontal drop down menus for aesthetic reasons. In such cases, a block horizonal area across the top of the screen, below the header might be a go place for navigation. This way a couple to three columns of blog content could be placed below.
Blog content doesn't just have to be words, so the pages can still be interesting with graphic enhancements,videos,etc.