DIY - Paint & rough up some wood (not too heavy- thick) Buy some Burlap from the Fabric Store, Create a Stencil or go to the Office Supply store & have them blow up a letter & then you cut it out for your stencil. Use Spray paint or acrylic paint. For the Pegs/Nails - Home Depot- Lowes should have some.
Organize Paint and So Much More - A few shelves, a pegboard and some mason jars will go a long way in helping you to get your garage organized. If you have cans of leftover paint that you don’t really want to throw out, put it in mason jars.