Some students included links to the Themes page, and some did not. Unix is case sensitive, so links that may have worked in a Windows environment don't work in Unix. Similarly, Unix does not like spaces in file names, so My Page.html is not a valid file name. Some of the individual theme pages use images that do not have transparent backgrounds on top of background grahics. That leaves a white rectangle that is probably not desirable.
Some pages have transparent gif's that exhibit a halo effect.
This results when transparency was created for a light background, and the graphic is used against a dark background. Pixels that are nearly white are not made transparent, so produce the halo. Some individual pages do not fit left to right on an 800 X 600 screen. This can distort the image if you don't maintain the original ratio of height to width. Also, the graphic will look small, but will actually still be large, and so may take a long time to download.