I like the look of this electronic noise maker built inside a pill bottle.
I found this pill capsule because someone in my house needs horse pills, evidently. I basically drilled the holes, used Epoxy to secure the battery holder to the speaker, and crammed everything in there. I love one night projects.Link
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.