http://www.iconfinder.com/icondetails/34752/128/beos_people_...
UPDATE: If I remember correctly, the original BeOS icons were all 32x32 pixel art. I didn't find the original in my first quick Google search, but I found the above link instead which appears to be from an open-source stock icon set based on a vectorized version of the BeOS artwork. It also happens to match the image used on the MobileWorks site. Here are some of the original icons from BeOS: http://dsandler.org/entries/images/2007/beman.png and http://media.soundonsound.com/sos/feb00/images/beos_1.l.gif
I didn't mean to imply that MobileWorks was copying anyone (or for my off-hand comment to get voted to the top of their launch announcement discussion). Their web site may be a licensed use of this stock art, which itself is an inexact copy/interpretation of the BeOS art.