Kids can practice fine motor skills, learn about other cultures, and be occupied for HOURS with these insanely detailed & free to download paper folding kits. The site is in Japanese, but don't be put off- just click on the link you want and choose the button that has PDF somewhere in it. Just remember that Japan uses A4 size paper so you may have to adjust the print settings a bit.

Suitable for kids 8+ - some parental help may be needed as instructions are in Japanese-- but it's a good way for them to practice problem solving, too! (via YoKiddo)