Ok here's my stupid idea:

How about a mushroom cloud for 5k, since you're responsible for nuking so many posts!!!
A little explosion for 300 a slightly bigger explosion/smaller mushroom cloud (or maybe diff colour idk) for 1k.

I'm not a graphic designer so I can't make the icons 

You don't have to be a graphic designer when you have google  

They have to be exactly 16x16 px (like ), and if you find them online, then they must be copyright-free.