String art, also known as Spirelli, is really easy to do. All you need are some scalloped shapes and embroidery floss. Wrap the embroidery floss around the shapes you have a beautiful design that looks like it took hours instead of minutes to make.
Here is a card I made recently for my Sister-in-law:
It was made using three different punches, the Marvy Uchida Giga, Mega and Jumbo scalloped circles. I wrapped two layers of floss around the two inner circles.
I created my own shapes in Paint Shop Pro Pro to make this card:
Don't be intimidated by the cutting. It only took about five minutes each to cut the shapes out. If you want to try it, you can download a page of shapes here: http://www.handcraftedgreetings.com/pdf/StringArt1.pdf
You can also purchase Spirelli punches online from various craft retailers. This is not something I've done, so I do not have any recommendations.