Alien Mecha Paper Toy

No, it's not Mike Wazowski. ^^ It's an one-eyed alien bent on global domination piloting a mecha that looks like a Willys MB U.S. Army Jeep. The PDF template for this fun little papercraft walker was created by artist Daniel Benitez and may be downloaded here.

MLP Nightmare Moon Papercraft

In the world of My Little Pony, Princess Luna is a winged unicorn who was responsible for raising and lowering the moon each night. Because of her jealousy, Luna was transformed into the villain Nightmare Moon. This Nightmare Moon paper model was created by Muffinshire and may be downloaded here. Photo instructions are also available. Build photo by DeviantART member x0xChelseax0x.

Leonardo Papercraft Vehicles

The BBC's children's television series Leonardo features an imaginative story line that follows the adventures of a teenage Leonardo DaVinci. The kid's activity page for the series features four free paper models of Leonardo's inventions. Included in the set are a tank, a bicycle, a glider and a submarine.  The templates for the papercraft vehicles may be downloaded here.

1965 Ford Thunderbird Papercraft

This 1965 Ford Thunderbird is one of many paper cars that JCARWIL offers on his Flickr page. Each of the JPG templates for the cars is color-it-yourself and may be printed and colored by hand or colored with a program like Adobe Photoshop. The two seat Thunderbird was introduced in 1955 as Ford's entry in the "personal luxury car" market.

Spock and Captain Kirk Paper Toys

Captain Kirk and Spock are two of the most recognizable and beloved characters in the Star Trek franchise.  Now, DeviantART member Goobeetsa has created cute papercraft likenesses of the pair for your desktop delight.

UPDATE 8/15/17: Sorry! These paper toys are no longer available. :(

Other Star Trek Papercraft:
Kirk and Spock Paper Models
Mini Phaser Rifle
TOS Bridge Playset
Captain Kirk's Command Chair

Grumpy Cat Papercraft

The Grumpy Cat meme has made it to the world of papercraft. Yay! This Grumpy Cat paper toy was created by TubbyPaws and may be downloaded here.  The Grumpy Cat meme began in 2012 when a photo of a cat named Tarder Sauce was posted on Reddit. Recently, Tarder Sauce's owners signed a deal for a Garfield-like movie in which the grouchy kitty will speak. Can an Academy Award be far behind? ;)

Cute Kaiju Paper Toy

An unfolded version of this cute kaiju paper toy was handed out to the first 100 people through the doors of ToyConUK this year. The name of this Godzilla-esque fellow is TCON. He is the official mascot of ToyConUK. A PDF template for the toy may be downloaded here.

Kingdom Hearts 2 Papercraft: Twilight Thorn

Twilight Thorn is a boss in the Kingdom Hearts 2 video game. He is the only boss-level Nobody that is not a member of Organization XIII. This paper model of Thorn was created by Portaldragon and may be downloaded here. The download includes both PDF and Pepakura PDO templates.

Superman and Supergirl Paper Toys

Superman and Supergirl are two of the most recognizable characters in the world of comic books. These papercraft version of the superheros were created by DevianARTist Wackywelsh who modeled them after paper toy templates designed by Xavier Gale-Sides. The PDF templates may be downloaded here and here. Click on the link on the right side of the page to begin the download.

Mini Post-it Note Glider

From Instructables.com:

"This instructable, inspired by the proliferation of micro-sized paper airplanes, contains instructions for building a miniature sailplane out of paper and a staple. It has a fuselage measuring 40 millimeters, a wingspan of 60 millimeters, and a height of 7 millimeters. Despite its small size, it has surprisingly good aerodynamics, which is due to the fact that it shares similar dimensions and attributes with full-size sailplanes... Due to these attributes, this small glider can glide for substantial distances, perform tight aerobatics, and even gain some altitude on thermals created from heaters."

Complete instructions to create your own paper glider may be found here.