I had used a 2 column version of the iTheme, which ws ported by ThinkEdge. This theme was originally created by Nick La of NDesign Studio for WordPress.
On the internet, I found a 3 column sample, but that one was not suitable for BlogEngine.NET. So I decided to edit the iTheme which was ported by ThingEdge so it will show up as a 3 column theme, or if you like, the i3Theme.
|Van Rob van Meeuwen|
You can just download it here at the bottom.
(Note, the background image of the download version is without the seagulls, just like the original ported iTheme which you can download also).