A long time ago, when spruce 2x4 was cheap, I cut up a bunch into 1 1/2" x 1 1/2" x 3" - still have more than a 5 gallon pail full. Grandkids call them "pretend gophers" - stand them at random distance in the grass - if hit, they bounce and flip. Also, if like me, a plethora of cut golf balls on hand - they work great too - as long as they can be seen in grass, they are a "viable" target for plinking. Holes in paper targets gets old really fast with the little ones - they want to see something happen, if they or a peer do make a hit.