I searched for "xscreensaver ugly" and found this thread. It's a bit frightening to see that after two years of talk, there doesn't seem to be a satisfying answer to this question.Might there be any news on replacements for xscreensaver?
Is there anything at all that can be done to modify Xscreensaver's login prompt? It's so incredibly ugly, but I have found no way at all to tweak it or replace the theme of it somehow. System-wide theme settings don't seem to affect it either.