A Klein bottle.
Warning: this Klein bottle does not open beers, it just looks cute. 
The Klein Bottle Opener is here on Shapeways or here on Bathsheba.com.
A bigger bottle is here.

Skyrim pendant

I made a pendant inspired from the The Imperial Symbol of the game Elder Scrolls V: Skyrim. I hope people who love this game also love this pendant. On the top of the wings are two holes, so you can wear it like a pendant. The pendant is double sided, both sides look the same. The picture shows the wrong way ;-0

I already have pictures of the pendant in stainless steel pictures in stainless steel

Also check out my Skyrim 'Dragonborn' ring Skyrim 'Dragonborn' ring.

The pendant is inspired on the game Elder Scrolls V Skyrim. The rights and intellectual property of the game belongs to Bethesda Softworks, which did a great job on creating the Elder Scrolls series.

This pendant features a mobius style spiral that can enclose a 6mm ball which jingles and jangles when worn.

If you'd prefer a right hand spiral, please see; http://www.shapeways.com/model/169011

NOTE:
Shapeways have decided that this model is unprintable with the ball enclosed.
This model will take a 6mm steel ball which can be fitted by gently forcing open the spiral... see video.
A 5mm ball is available here; http://www.shapeways.com/model/172759 or simply use a suitable (4.5mm-6mm) ball bearing.

It's a little hypercube pendant! There is a slightly bigger one here.

An alternative seashell.I'm very fond of my own instance of this design, and that doesn't happen often.A smaller version is here: http://www.shapeways.com/model/215947/whelk__10_5_cm_.html