Some interesting projects here include the Kirigami section, origami furniture and origami paper airplanes.
The theme can be anything from origami paper airplanes to Star Wars origami.
Paper airplane models vary greatly in complexity, ranging from simple airplanes for elementary school children to elaborate gliders that require sophisticated origami folding techniques.
Check out the slideshow tutorials How to Build the Perfect Paper Airplane and Paper Airplanes for Kids to learn how to make two airplanes that are great for young crafters.
Paper Airplanes that Will Fly the Longest has instructions for a simple glider plane that is appropriate for an adult who is new to origami.