Helmet skins change the appearance of your Helmet, along with providing some awesome bonus perks
List of Helmet Skins
Snorkler

- +5% Outgoing Damage
Tiki Mask

- +10% Energy Gain
- +10% Shard Gain
Clown Makeup

- Undying Torment (Passive)
- (Gain +0.75% Outgoing Damage for each missing heart)
Square

- Cash Pig (Passive)
- (Gain 1.5% Outgoing Damage for each digit in your Energy Stack)
Triangle

- World Conquerer (Passive)
- +20% increased drop rate for Celestial Keys
- Chance on kill to gain an additional item (Celestial Mobs)
Circle

- +22% XP Gain
- +22% Ore Gain
Graduation

- Chance to gain 2x Bandit Stashes in Bandit Capital
Screws

- +10% Outgoing Damage
- -5% Movement Speed
- Chance to cause Nausea to yourself
Stormbreaker

- Chance to strike up to (4) enemies with lightning, causing damage, slowness, and nausea.