Thanks, I'm glad you like the new profile customization features! The problem you were seeing with the background image is because every time an image is uploaded, an image processing service takes it and creates multiple resized versions. The customized profile was using the smallest of the resized versions, resulting in poor image resolution when it was used as a background. I have changed it so that with profile customizations, it now uses the originally uploaded file for background images. So it should look much better now.