Papercraft

I've been doing a lot of papercraft in the last year or so. I prefer origami since it's kind of a puzzle to try to figure out how to make a small piece of paper become a three-dimensional shape using only strategic folds. But there are bigger and more elaborate things that can also be created when you allow yourself scissors and glue.

You can start simple with a paper ceiling cat. [link]
He has a few more things if you go back through his archives at http://tubbypaws.blogspot.com/.

Or, there's a simple blank robot you can decorate yourself at http://www.instructables.com/id/Instructables-Robot-Paper-Model/.

Video game based papercraft can be found at http://papercraft-world.blogspot.com/.

Blocky characters with massive heads can be downloaded from http://www.cubeecraft.com/.

Canon printers has a good selection of things to make at http://cp.c-ij.com/en/contents/1006/. I recommend you spend a few minutes clicking through categories.
I created this Cheetah and this Eiffel Tower for Yummy.

There's an interesting looking zeppelin (and other stuff) at http://www.currell.net/models/mod_free.htm.

I'm looking at tackling some of the creations from sci-fi lore at http://www7a.biglobe.ne.jp/~sf-papercraft/Gallery/Gallery.html.

Not sure if this counts as papercraft, but if you're one of the people still keeping Starbucks in business you can make a tie-fighter from coffee supplies by looking at the directions at http://howto.wired.com/wiki/Create.

I have an awesome paper TARDIS in my office that someone designed so his son would have one scaled to his Dr. Who action figure. But, alas, I can't find the link back to it. There are others, but they're just not as good.