Artists, keep this in mind this holiday season...

Mistletoe has yellowish-green, smooth-edged, teardrop-shaped leaves with white berries.
Holly has deep green, pointy leaves, thorny branches and red berries.
You kiss under the mistletoe, while holly is used to deck the halls.

Berries of white, kissing's alright.
Berries of red gets you hit in the head.