There's nothing that says "I love you" like a skull-themed piece of jewelry. While this Tarina Tarantino bracelet looks pink in the seller's photo, the skulls are actually a pale pastel nude Lucite.
For a more traditionally gothic look, here's a Tarina Tarantino skull necklace that she named "Evensong."
Here's a pair of skull earrings that match it, too.
I find this "Reliquary Locket" extremely romantic.
For your goth boyfriend: A pair of cozy Nightmare Before Christmas pajamas. Or here's a similar set for your goth girlfriend. It glows in the dark - that's so cool! (I'd steer clear of the very unsexy Nightmare Before Christmas Blanket with Sleeves - too similar to the lame Snuggie.
How about a darling little "Bride of Valentine" mini Living Dead doll?
Happy Valentine's Day!