I was having issues with the 3-column layout. There just isn't enough room for text and pictures when you've got 2 sidebars (sometimes the text was encroaching on the pictures... which made it almost impossible to read). I hope this will remedy the problem. I've used *.png files, which apparently don't display transparency properly in some older browsers (like IE6). So if the images have funky coloured borders, that's probably what's going on.
The background and colours are easily changeable; for now, I just want to make sure the layout is displaying properly. So if it's not, could you let me know? I'm new to this template-tweaking business.