Minecraft: Colourful rainbows from snowballs :P

Throw a snowball (but not vertically) and have a woollen rainbow appear!

/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/fill ~ ~0 ~1 ~ ~-11 ~1 redstone_block},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~3 ~-10 ~-1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~7 ~ wool 4}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~3 ~-9 ~1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~5 ~ wool 11}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~4 ~-8 ~-1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~6 ~ wool 5}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~4 ~-7 ~1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~4 ~ wool 10}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~5 ~-6 ~-1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~3 ~ wool 6}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~5 ~-5 ~1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~9 ~ wool 14}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~6 ~-4 ~-1 command_block 0 replace {Command:/execute @e[type=Snowball] ~ ~ ~ /setblock ~ ~8 ~ wool 1}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:gamerule commandBlockOutput false},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:"fill ~2 ~-2 ~ ~6 ~-2 ~ redstone_block"},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:"setblock ~2 ~-1 ~-1 command_block 0 replace {Command:/fill ~ ~ ~1 ~5 ~ ~1 stone 0 replace redstone_block}"},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:"setblock ~2 ~ ~1 command_block 0 replace {Command:/fill ~ ~ ~-1 ~5 ~ ~-1 redstone_block 0 replace stone}"},Time:1,Riding:{id:"FallingSand",Block:stone,Time:1}}}}}}}}}}}}}}