How can I use iMac webcam to take photos of myself?

I want to take a few full-length photos of myself (without using my camera and bathroom mirror). Photo booth has a 3 2 1 countdown when you take a picture. Is there anyway to delay this a few seconds more to pose? Or are there any other programs you can download that will do like a series of shots so I don't have to keep running to the computer to click a photo?