well they're selected on a per-user bassis, so if someone chooses an awdul bright purple or red, it would only be for that user's session. anyone else would have the default until they select their own combination.

making it look professional (i think it's ugly, by hey, they might like it) wouldn't beas of large concern. they chose it, so it shouldn't drive them away. but i woudn't do it just because other people wanting it ugly would bother me.