Keep it interesting and mix it up.
Update 26.08.2014: This Obstacle course takes the cake.
Update 27.06.2014: David Durante goes through a pretty long Handstand obstacle course that even includes Handstand Push Ups.
PS: Also check out Dave’s “Bring Sally Up” with Handstand Push Ups.
Update: Here is David’s Handstand Walk Obstacle Course #2
Update 13.01.2014: Here is another neat course.
Original Post from 19.01.2012:
Do some Handstand Walks. And when you get proficient, build a little obstacle course.