brkn_doll over at WoW Ladies rolled a Draenei shammy to join up in her friends' guild, and when she picked up the tabard for it, she saw... well, unless you're color blind, you can't miss it*. As she says, she looks like a pumpkin.
What do you do when you finally put on a guild tabard, only to find that you wish you could take it back off again? For April Fool's Day, my guild leader turned our tabard hot pink, which I actually thought looked kind of good on my female Blood Elf mage. My shaman wouldn't have looked good in it, but he's wearing the Tabard of the Protector anyway, so there's one option: get a new tabard.
Not all of them are bad-- my gnome warrior was in a guild for a while with a blue and gold tabard, and that little minitank looked good. Have you ever confronted a guild leader about their bad tabard choices? Or if you're a guildleader, what made you choose your tabard colors? If they're orange and green, you should probably just go ahead and pay the 10g to fix it, because if doll's experience is any indication, it's hard to look like a badass when you're wearing a pumpkin.
*Because I know someone will ask, her strikingly clean UI is apparently built with Tet's UI. You're welcome.