A common simple puzzle consisting of six 15 x 15 x 60 mm block pieces. Plans and solution are available via this website: http://homepage.ntlworld.com/bruce.viney/index.html

Also I've made the plans available to download in case anyone wants to modify or create their own. 

Bottom half of paper magnet puzzle. I have not tested this part yet (but I did create and test the previous version, so this should work). Look at the top half for assembly details.
The previous version was not tight enough for my liking so this one is made tighter, and thus might have to be slightly sanded in the shaded blue region on the second picture.

Opposite ends of this die smoothly loft into each other, intersecting with other pairs.

Top Half of 1" diameter Paper Magnet Puzzle (must order with bottom half... if you want both halves). This is called such because it is designed to lock with a magnet and to be opened with paper or something thin. This particular piece has not been built (a previous version was built and tested and worked fine but I wanted to adjust a few things. I haven't made the new version as I have had no requests). I made two tops and two bottoms, using strong and flexible and detail plastics, either worked fine.
To make it according to my design you would want to also order:
4 neodymium magnets which are .060" thick and .250" wide with the magnetic axis through the faces (axial).
Also you would want a cylinder .100" in diameter to fit in the holes. 1 hole is for locking in the two repelling magnets, the other two holes are optional.
With frosted plastic (slightly transparent) you can put in glowing powder in the top half (recommend V10).
Magnets 1 and 2 must be glued in (one in each half) so that they attract each other.
Magnets 3 and 4 must not be glued and they must be inserted so they repel each other.
I have used common 5 minute two part epoxy and I have used super glue. Either appears to work for the pins and magnets. The magnets should be pushed into position while the glue cures for the best adhesion of the glue.
As seen on the first picture this also has a small logo on the inside face (it is small so it can't really be seen in "strong and flexible").
The solution to the puzzle is to use something thin and push magnet 4 back and then slightly rotate the parts and then let the halves come back together and continue rotating until the hook reaches the gap, then pull the halves apart.
Fairly simple, but hard to see at first.

A board game token designed to look similar to the Minecraft spider.

Cube Created in Blender

1 ghost die, for when you feel like you need to do some bustin'.

The seal of the head of the Time Guys. This one is available for free download. If you do, I just want to see what you do with it.

A small model of three books and a round rubber stamp, designed to be used for board games.

1000k polygons object available for download.

Shapeways Image Popper

A large version of the Pentomino ring --- a 3 by 20 Pentomino packing wrapped into a cylinder. This design could be worn as a (very loose) bracelet, but I'd be interested to see other novel uses for it.

Gadgets for game.

A coin bearing the five fingered hand of Eris on one side, and the number 5 on the other. Check out my 3D models repository for more.

those peaces made to create a cube when bonding them together right, try it yourself!

That's my first modell.I made it in Minecraft.

The Eiffel Tower by Mauricio Vives, built in Vokselia using Minecraft and exported using Mineways. I had to play with the settings for export (you can download the model and look in the .wrl at the top to see what values I chose). I *like* to think this model will print correctly. I did turn on "use lesser blocks", which sometimes doesn't work great with Shapeways, as the geometry has to be merged.

Battle flags are the target models in a game of Seej. Seej is an Open-Source tabletop wargame based around 3d printing.

This model contains 3 snap-together flags, typically used for pickup games of Seej.

Seej has 4 Core Rules:

1. Topple your opponent's flags to win.
2. Players must agree to the models used in a match.
3. Keep it friendly.
4. Show no mercy.

Expanded Seej rules and more information are available at www.s33j.net