You can build some outdoor furniture and paint it. Slats like that work well for simple furniture. Also a good idea would be some crates for organizing. You can build a shelf and put all the crates on it, labeling them and such. Check out some shelving as well. Those ladder shelves are built with stuff like that. I wouldn't spend the time gluing up, just purchase other boards for that.
Wall racks are always convenient as well as racks which hang from the ceiling. A lot of times I end up using a cart to throw things on if I know I will be using them shortly. That way you can move it around as you work in different areas of the shop