I’ve been attending conventions since going to Anthrocon back in 1999. And over the years, I’ve managed to hang onto most of those conbadges.
Most of the conventions I’ve attended (and staffed!) were furry conventions, but there was also a few gaming an anime cons in the mix, as well as BronyCon.
I have since taken pictures of every con badge I am still in possession of, and have uploaded them to Flickr. You can view the archive here.
Enjoy!