I enjoy purses of all wacky kinds.
Or perhaps cool jewelry like that you can get at Express for around $20.
------------------ Music, when soft voices die,
Vibrates in the memory;
Odours, when sweet violets sicken,
Live within the sense they quicken.
~P.B. Shelley
Um, if you're super broke you could give her a bag of really small stuff, from like the dollar store...possible items:
~ Wonder Woman Pez
~ cute stickers
~ candy necklaces
~ picture frame (with pic of the 2 of you in it)
~ plastic princess tiara
~ nail polish
~ candles
~ coffee mug
~ anything she'll think is funny
~ Make a silly card (you don't even have to buy this one!)
I've done this sort of thing before and if someone has a good sense of humour it works out okay. Although I don't know how serious you are, or what it's for...
I jumped on the word 'quirky' in your enquiry and thought of a couple of stuff.
You could collect fingernails or toenails of your friends or whatever. Collect them until they fill a tiny bottle or box. You could then write her name on each of the nails. What is the point of it all? - I dunno. You could do the same thing with rice but it would not be quirky, just romantic.
You could paint smooth rocks to become paperweights. Rather than paint cats and cutesy animals, you could paint a butt or something.