A birdhouse in the shape of a pineapple - why not?
The spikes help to keep predators away.
First, choose your pineapple - PineappleMan2.STL has scales, PineappleMan.STL is smooth - then print...
Printed unsupported in yellow & green ABS on a Replicator using Makerware's default "low" settings.
I've included a photo of the print along with the sketch it was designed from.