I've shown Her here with (of course) many many flowers, all natives of Mexico; She's holding a bouquet of dahlias (the national flower of Mexico), has strings of fuchsia in Her hair, and is crowned with a garland of marigolds and petunias. The marigolds are somewhat after the garlands typically seen on Day of the Dead altars; She doesn't have anything to do with that holiday (that I know of), but it seemed appropriate. Of course just now I read that marigolds are especially sacred to Her; I didn't know that when I drew Her.
Her name is made up of two Nahuatl words, xochi meaning 'flower', and quetzal meaning 'precious feather', specifically of the bird which is also called the quetzal. She wears the green feathers of this bird as part of Her headdress.
I've put up some prints at my deviantArt gallery here; and some t-shirts over at Printfection here. Enjoy!