Like lots of people I also have the problem that I never have enough space on my workbench. To improve the situation a bit I decided to build a small shelf. I had these thin plywood sheets from a previous project still laying around and so I designed it around them.
They are roughly the A4 sized so it really is a rather small shelf. I cut a couple of strips and glued them together as the pillars the different levels would be resting on.
After I put in all the layers I used some scraps to stabilised it a bit and that was basically it. It is not big and not all that sturdy but it works for my use case. I know another one of those really small builds but it is something that gets used and I like building things that I actually use.