You could paint them and use them as row markers in your vegetable garden.
Anything that would thin wood strips. Backsplash, stair risers., drawer dividers, mirror trim, tabletop...
Left over blind slats | My Crafts | Pinterest | Projects, Repurposed and ...
Make useful garden plant labels. Cut to size and paint or use some wood preserving coating if want them to last more than 1 season.
This is another good place for ideas. Hope it helps.