Koinobori (Japanese Flying Carp) DIY from Squirrelly Minds.uses toilet paper tubes and colored tissue.

47 Incredibly Fun Outdoor Activities for Kids - DIY Cardboard Ring Toss Game

It's also super easy with these printable road templates.

It's amazing what you can create out of the humble egg carton. Here is a list of 22 egg-cellent egg carton craft ideas to try with your children.