2 (25-inch) hanging standards and 6 sturdy 6 1/2-inch shelf brackets (about $18 for all; we used the Rubbermaid twin-track system, available at Lowe's, Home Depot, and hardware stores)
6 wall anchors
6 screws that fit in the shelf bracket holes
4 drywall wall clips
2 wire bike baskets (ours were $20 each at Target)
Install the hanging standards with the wall anchors, spacing them so that the shelf brackets will fit inside the skateboard wheels
Attach the brackets to the standards, spacing them as desired to create 3 shelves.
Place the skateboards on the brackets and push a nail through the bracket holes nearest the wall to make a mark on the skateboard for the pilot holes.
Remove the skateboards. Using the nail impressions as guides, drill the pilot holes (being careful not to go all the way through), and then attach the skateboards to the brackets with screws (ours were 2 inches long, but the length depends on the height of your brackets).
Below the shelving unit, mount 4 drywall wall clips to secure the 2 wire bike baskets.
Using a craft knife or hacksaw (parents only), cut the tubes just longer than the items to be stored, neatening the cuts with scissors, if necessary
Paint the tubes if you like and let them dry.
We assembled the smaller cubby by first marking each line of contact, then gluing with a bead of low-temperature hot glue. The larger model is fastened with black metal binder clips, whose road hazard motif was created with strips of yellow craft tape.
Draw a line around the tube to ensure a straight cut.