If you knock all the sharp corners and edges off...give them a quick sanding, little kids will love them as 'building blocks'. You could assemble them into circles (four quarters) and glue a simple colourful picture on it; trim and separate the segments, and you've got some puzzles for toddlers.
Fins for wooden sharks, art deco clocks, ears for large wooden animals, desk pen & pencil bases, supports for router table or drill press fences, brackets for corner glue ups, shelves for corner knick knack display, sanding block for inside curves ... lots of potential there.
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