This is a command block mod that I made... It is in it's first stage.
Feature One: Snowballs will leave a particle effect in the sky.
Feature Two: Whenever you shoot a bow, it wont shoot an arrow, it will shoot a Fireball
Feature Three: You will leave a cobblestone path underneath you when you walk on dirt and grass.
That is it So Far. These are the commands you can use connected to a fill clock to make it yourself.
/execute @e[type=Arrow] ~ ~ ~ /summon FireBall ~ ~ ~ {direction:[], ExplosionPower:3}
/execute @a ~ ~ ~ /fill ~ ~-1 ~ ~ ~-1 ~ cobblestone 0 replace minecraft:dirt
/execute @a ~ ~ ~ /fill ~ ~-1 ~ ~ ~-1 ~ cobblestone 0 replace minecraft:grass
/execute @e[type=Snowball] ~ ~ ~ /summon FireworksRocketEntity ~ ~ ~