I liked the old theme I was using before today (SoundWaves: blue), but there was one thing that really bugged me. The old theme's layout had the links down the left, the main blog in the middle, and the calendar sat in a column all by itself to the right. All of the space under the calendar was wasted. I didn't think that moving the calendar to the left would look very good, so I decided to change to the two column theme I'm using now.
This theme (Moveable Radio: blue) heavily uses CSS (styles) to create its look. I had to do some fairly extensive customizing of the theme (especially the CSS) to make it work the way I wanted it to. I think there's a few things I may have not done correctly in the CSS, but it was the only way I could get it to render correctly in IE6.
If you don't think my blog is rendering correctly for you, leave a comment and I'll see what I can do to fix it. I'm still learning CSS, so if you have some sample code to fix the problem you are seeing, that would help a lot. I do not have any other browsers installed, so I cannot test any fixes myself other than in IE6. If the CSS ends up being unworkable, I'll convert the blog to a table-based layout with the same look. Hopefully it won't come to that.
Beyond that, I'd welcome any suggestions and comments on the new theme. No guarantees that I'll use any of them, but I want my blog to present well and be easy to read.