I was visiting a preschool the other day and I absolutely LOVED their creative idea for 'parking' their 2-wheel bikes. Currently, we battle the parking solution every day. Our creative Outdoor Curriculum Specialist marked off 'parking spaces' in red duct tape for the 3-wheelers. But the 2-wheelers tend to get dropped, flopped, and abandoned without much thought from our pint-sized riders.
I must say, we will be creating this parking solution at our next site work day. The racks are simply a large round of PVC, painted red, and held down with curved PVC joints that were cemented to the concrete. Large slits were cut into the PVC to accomodate several front tires from the bikes.
Marvelous!!