Keyrings are one thing I really won't spend money on because they get wrecked. Only reason I would buy something expensive is to use it as a bag charm.
My keyring is a big squishy Oogie Boogie from Nightmare Before Christmas that I bought from the Disney store.
Mine is a LV Pomme vernis cles I got last valentines-it holds my house and office keys but more importantly it holds my drivers license and some dollars-love it!!!!!!!!
I have a speedpass for the gas station. It looks like this (it's only ~1" IRL):
and this:
And I have one car key. Very boring I know, but I'm not a fan of big/heavy keychains.
I also have a different keychain that I carry with a house key, work key and spare car key. That one has a handmade pewter heart that my mom got for me-- it has sentimental meaning. I have a Prada keychain and a Coach one, but I don't use them...