The continuous shelf designed by Ivan has been as handy as the Skadis pegboard.
One thing I wanted to be able to do was have a safe place for my Lego VW T2. The continuous shelf fits perfectly, but I was worried that the VW would roll off.
So I made a little speed bump to stop it from rolling off. This could/should work with anything that you want to put on the shelf that is prone to rolling off.
The author remixed this model.
Based off of the shelf itself.