Anyone have ideas other than heart shapes?
the right combination of colors immediately makes me think of valentine's day. I'd say a pink ribbon/stripe through a rich red background is a subtle but effective reminder.
You may explore direct references to Love:
- Cupid as an angel with a bow, son of Venus
- Venus (goddess of Love)
- a couple kissing
Or maybe something less direct:
- a love letter
- red roses
If it is about symbols, I think I'd go for something like a candy heart or something neat.
The heart symbol is widely accepted as symbol for love – mostly in terms of innocent, deep and heartfelt sympathy.
In case you aim to be unique with your choice of a iconographic symbol; don't choose something unusual for the sake of being unusual.
Perhaps, if you have a specific context, it can be appropriate to choose something special, but that should be reflected carefully.
Lets say, you have a site about lashes-fetish or stuff – perhaps it'd do better to depict some lingerie arranged as a heart, or have black leather strings forming a heart.
Otherwise, if it is just a random context (what is yours?), I'd stick with the well-established standards.
How about a lipstick'ish kiss-mouth shape?
Rose blades spread out on a soft pink background.
Chocolate could fit in to valentines day together with other symbols. A box of chocolates is quite usual as a present in valentines day.