This hobbie goes back to when I was about 8 years old. My parents bought me a few books on origami; I was hooked on folding paper. Since then I have purchased several books and learned to fold some pretty challenging models.
"Mouse," original design: Unknown
From the book, "Origami Omnibus"
"Performing Seal," original design: Fred Rohm
From the book, "Secrets Of Origami"
Some related links:
Joseph Wu's Origami Page
Paperfolding.com