I need ideas of an original artwork to get my g/f for christmas?

For 150 dollars you can't buy much, however... try a href="http://www.SylviaKulaArt.com" rel="nofollow"http://www.SylviaKulaArt.com/a , it is a website of well known, extremely versatile New Zealand/Australian artist Sylvia Kula. She can do anything, accepts small jobs and ships worldwide. And her prices are very reasonable, too - I think her pastel portraits (original, from your photo!) start from only 90 AUD, including postage to anywhere in the world. Your g/f should be happy with a timeless, original gift like that - good luck!