Inexpensive way to make binary counting come to life!

I just found a goody bag I won from Techbridge that I will use to bring computing to life for my students! I have a paper-based lesson on binary numbers from Computer Science Unplugged (which also has a whole curriculum about computer concepts "unplugged" from the computer), but my RAFT goodies also included materials to make binary birthday bracelets! Total score and I didn't remember I had this great tool! If these kids don't get binary counting after this then I don't know what better way to bring the concept to life...