Recently, I’ve gotten very involved with cardstock modeling. One of my projects is making a holiday ornament or three out of cheap cardstock I run through my inkjet printer.
There are many sites on the web that offers free downloads that you can print, cut out and assemble. It you’re a teacher, these kits make great classroom projects. Here’s a few links to get you started.
Canon Printers has a huge collection of free paper art downloads:
http://cp.c-ij.com/en/contents/1006/
Here’s the Christmas collection from Delta 7 Studios:
http://www.delta7studios.com/santasshop.htm
The more advanced paper modeler (or less lucid) might wish to give this project a try:
http://amoebabloke.deviantart.com/art/steampunk-x-wing-kit-download-90228186
Advice, tips and links to thousands of models can be found on the PaperModelers Forum:
I hope this gets your creative juices flowing!
May you and yours enjoy a happy and safe holiday season!
Anthony Stevens' Weblog 
Had to leave a comment to say THANKS!
This is a fantastic idea for my Biology and Environmental Science classes. My students prefer hands-on, but we’re perpetually short of hands-on projects (since most of the components are expensive and expendable). What we do have, though, is a well stocked graphic arts / print shop class, and 110 pound card stock is cheap, so…
I haven’t found any that work just right for my classes yet, but now that I’ve got the idea, I’m certain that I can find some for Enviro-Sci and the Biochem section of Biology.
Thanks again!
You are very welcome, Robert.
I’ve seen some biology card stock stuff before. Various animals as well as some lovely flowers. Here is a discussion from another biology teacher regarding cardstock insects:
http://www.papermodelers.com/forum/other-builds/8143-cardstock-insects.html
You might even consider making your own kits as well.
Glad you found it useful.