How would you make a shadow with a custom textured

I have a player moving a corn maze so I want a custom shadow that looks like corn. right now I have all of the normal shadows and lights working but I don’t have anything meaning I have no code either.

You can use the 3d model of corn


its 2D topdown sorry that was not clear

You can check this shader

i dont think this is the approach i want to go with anymore thank you tho