I have a "Greatest Teacher" one that I got from one of my favorite classes (special education class that I volunteered in for a while), one that powernapper made for me that's a group photo of our Deck Party bike ride and various other ones. Today I am using the teacher one.
We've got a few bike-themed coffee mugs at home. A couple with our LBS name/logo on it, and a couple from Giant that a former employee and current RM member was kind enough to send when MBC bought her Giant road bike.
I USED to have a awesome "Kona Coffee Co." cup til my wife gave it the wash of death (dropped it whilst drying). It had asses on it. Not THOSE asses...the donkey kind!!!! Any ways my cup now is just basic black...
At home I have an old yeti coffee mug that is like 20 years old with a bunch of bike stickers, it's from my first bike shop job and is the mug I drank from when I first got hooked on the heavenly bean juice.