Tissue Paper– You can print on tissue paper, but due to it being so delicate, use a light adhesive to paste to a regular sheet of paper or cardstock. Once printed, carefully peel free. And why print on tissue? See below-
Index Cards- These are perfect for not just recipe cards, but note cards as well. I use them to make password cards I can keep in a recipe box next to my computer. Remember to change printer settings to fit to index cards specific to their size.
Check out these sites for some neat printing projects:
Canon Creative Park- Lots of fun printing here including cards, scrapbook items, paper toys, and more.
HP Creative Studio- Here you can find lots of printing ideas from party supplies to photo gifts.
About.com Printing Ideas Page– This page will continue with lots of neat ideas for printing things.