This was a fun one, in celebration of "County Fair Week." I created the tent, roller coaster and ferris wheel, and then painted on the fairway with black paint. I made various boy and girl figures using a stencil, and the children decorated them. (Have them color before you cut so they don't rip off paper limbs in their vigor.)
To make the cotton candy, mix food coloring and water in a small bowl and soak cotton balls in it; allow to dry over a weekend. Glue bits of this into tiny paper cones.
The balloons were colored and added later, with yarn for the strings. The border is made of strips of tear-off event tickets that we had lying around in the storage closet. Click on the photos to see larger versions.