EDIT-- ADDED STYRAFOAM EARS
So I've seen all of those deadmau5 heads and i like them....but they don't hav to same look I thought so i teamed up with my dad and this is what we did.
Polystyrene Foam-home Depot
2-4.5" acrlic globes-home depot
1-13" hamster ball-pet store
electrical tape-home depot
4-fully threaded rods with matching washers and nuts
various painting tools
hot glue+hot glue gun
Step 1: Making the base of the ears
So you just place the rods where there supposed to go after measured then hot glue the layers together and sand down the sides lightly. After, cover the ears with bondo and yes it will dissolve the base a little but it DOES work. Just take your time and be careful.
Warning: wear gloves and respiration mask for your health.
LEARNING OBJECTIVE: learn how to use bondo,paint,sand,and scale a project.