Looks like they'd be great for storing portable power tools, like circular saws, drills, etc. Just be careful of how much weight you put in them - if they were originally designed to hold hotdog buns in the grocery store, they might not hold up to heavy duty storage. Are there any labels on the back/bottom that describe the weight capacity?
Also, you might be able to find different brackets to fit those standards for regular shelves, if you don't like the baskets. Or find matching standards to screw into the wall to clear up some floor space.