I have a small problem and surplus, same as you! You already covered everything I use them for too.
Drill some holes in the bottom and you have a redneck planter. That's all I got! Curious to see others ideas too.
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Travis
1993 Cub Cadet 2064
1988 Cub Cadet 2072
1980 IH Cub Cadet 782 w/CH20
1966 IH Cub Cadet 102 w/K301
1961 IH Cub Cadet O
1967 IH Cub Cadet 102 & 122
JD 2155 w/ 175 loader