Sounds like a great idea... Who wants to shoot "target crackers" with me? Bring your own .22LR loaded up with #12 shot!
they used to make those things in-the-way-back-when, always wanted one, never got one, and 22 shotshells is exactly what they were for, too !
would be a hoot out of a single shot 22 cheapo rifle, like maybe a Favorite or NEF
tried the paintballs, but just wasn't enough splash to fully satisfy the child within
the half size cheapo soda pop cans splash good w/ a 38 revolver at 75 yards, but use 'em up too quick, too much walking to seet 'em up
dandelions, when in bloom, make fair targets for a 22, and no walking downrange required to set 'em up
but I still have to vote for hard foam practice golfballs and baseballs for most durable fun, provided you watch your backstop, hits count, long bounces get extra points, but high bounces gets big bonus points... the gold medal goes to whoever gets 2nd hit before they come to rest... or whoever runs 'em downrange further/fastest
have oft thought of frozen or semi-frozen jello in small somethings, never got around to trying it out, though... some in a small balloon maybe ???