I might avoid a necklace entirely, given the pattern is pretty busy and the neckline should be pretty. A thick twist of beads to fill in the neckline if you feel it's too deep, maybe... Otherwise I'd highlight earrings and rings, probably.
A brightly coloured belt and shoes and bag in bright colours (yellow, orange, red, green, blue --- all should work! and need not be the same colour for all) would be fabulous if you keep the jewellery pretty simple or absent.
If you *are* wearing chunky jewellery, like Sarah suggested, you could also let them have centrestage if the pendant is particularly full of character --- in which case an animal-print bag, belt and shoes would add chutzpah without competing too much.