This is MakerBot's "Cute Octopus Says Hello" model (http://www.thingiverse.com/thing:27053) with custom slicing to make it print as a shell with no base.
With a hollow Cute Octopus, you can put an LED inside to make a nightlight. Or, scale down to make an eraser-protector for your pencil! The third overturned octopus in the last picture above shows this particular hollow, floor-less slicing.

The files included are .makerbot files, because that is currently the only way I can export the sliced hollow model from the MakerBot Desktop/MakerWare software. If you don't have a MakerBot machine with an SD card then you'll have to slice it yourself from the original Cute Octopus model. To learn how to do that see the links below.

Printing tips for beginner octopi: MakerHome, Day 303

Hollowing out an octopus: MakerHome, Day 304

Octopus pro - outer shell only: MakerHome, Day 305

Scaling down the octopus with math: MakerHome, Day 306

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