I always went with the day i was born for which ever sport i was doing. If 5 was taken i'd do the month (10, which you already shot down) if all else fails break down the year i was born 1987. 19, 8, 7, 16, 17 and any other combination you can come up with.
Tiocfaidh ár lá
Droid X 2.2
rooted & Deodeodexed as of 3/26/11
yet to be rooted...
Rooted since day 1