Way back in HIGH level garrison (55) there were some fun earrings:

Plantoid earring
Vermin Earring
Amorph Earring

They would give +3 Killer Effects in 1 categoary and -3% Killer effect in the other.

In the spirit of gear like Fotia Belt, and Hachi-rin no obi, It would be really cool to have an Earring that gives +3 Killer Effects

Please give this poset a + if you like the idea!