Have left over PVC pipes from all those marshmallow shooters? Make a sprinkler (just drill holes and attach to a hose) – Link.

Killer marshmallow gun – Link.

From the pages of MAKE:
Make 717
HowToons. MAKE 02 – page 172. Make a marshmallow shooter. Subscribers–read this article now in your digital edition or get MAKE 02 @ the Maker store.