3
you did the Art theme right?
In your left column, you have a repeating image as background. I'm trying to do the same, but my image is 120px high. at the moment, the left column is completely filled with the image, but where the blocks sit on top of the left column, the background image is covered over.
Have a look at www.bassmanthemes.x8r.com and choose nwn as theme. it's nowhere near ready, but you should get an idea of what I mean (IE6 only).