How can make use of leftover laminate flooring planks?

I would recommend you save at least one box in case you need to replace a piece or 2 or 3 over the years. That leaves you one box...... why don’t you just return it and get your money back?

Robin's ideas are great. If not, then if you have an area where you keep items that might leak (bleach, cleaners, oil in the garage, etc) then you can put some of them down to protect the cabinet or shelf surface.

I used my leftover laminate to line the joists in the attic for extra storage space.

You want to keep several of these (at least a box) as the laminate can become scratched or warped. And will need to be replaced. Also if you redecorate / renovate, and say move a cabinet , you may need to use them. But they are useful to place in the under sink cabinet to keep it looking nice.

Hi Sharon This article might have just what you are looking for or give you some inspiration

https://www.flooringinc.com/blog/10-ways-use-leftover-flooring/!

Save ok be box for any future replacements & use a few planks cut in different lengths glue together off setting the planks & it can become a wall art piece. Vertically or horizontally. Attach a piece to a small section of 1x3 board or 2x4 sanded edges on boards, glue or tack piece plank floor fitted on top of wood, drill about 4 or 5 small holes lengthwise & screw in glass door knobs or decorated knobs & hang on a wall screwed into studs for coat rack or bathroom towel rack. We had alot left over from another house & it was enough to do a wall in our dining room & it really off set the room just with that look of one wall.