Comp cards are really what is sent out. There are other options, like sending out a series of images, or a CD of images. The CD is a bit tricky, because not everyone has caught on to the digital age. The series of images is cool, but you need to make sure you are really hitting your target market with the images you send.

It's not really the type of promo you are sending, so much as it's the followup after. Calling, setting appointments, keeping them.