We recently rented a shop for storing and prepping materials. We want to organize and put up shelves before getting too much clutter built up there. I can be crafty and cobble together a pretty sturdy shelf unit but, don't have a clue how to make the brackets/bracing for "floating" shelves. I have a bunch of L brackets but will run out of them quick. I have seen like triangle shaped braces made out of 2x4 stock but have no clue how to construct them to be sturdy and weight-bearing. Any suggestion or direction here will be greatly apreciated.

Rich Kelly