I used 1/2" Schedule 40 PVC, but you can use larger diameters if you need more stability. You can also adjust the dimensions if you want it a little larger. Get the joints that slip together, not the ones with screw threads.
5 - T joints
1 - cross joint
3 - 90° elbow joints
9 - end caps
Quantity - Pipe Lengths:
1 - 2"
3 - 3"
2 - 8"
2 - 13"
5 - 14"
2 - 18"
PVC Cutter (or a traditional saw)
PVC primer / glue (if you don't want it to come apart)
Krylon fusion paint (if you want it colored)
Put the pieces together into the goal (see the exploded diagram). If you want it to be very stable and not come apart, use PVC primer/solvent welding on the pieces (check the dry fit first).
If desired, paint with a plastic-bonding paint such as Krylon Fusion line of paints, or decorate it with stickers/streamers, etc.