My car has WDW Castle W/ Tink License plate on front; Been There, Done That, Going Back License Plate Surround on Back; Tink Steering Wheel Cover; Suction Cup Flying Tink on rear-view mirror; Back Off I'm Grumpy stickers on both rear passenger windows (got to be careful in winter not to scrape them off with the ice).
On my Motorcycle helmet I have 4 Tink Stickers and a sticker on each side that say "I'll Never Grow Up".
DH's car has Mickey stickers on both rear passenger windows; Sorcerer Mickey License Plate on the front; Been There, Done That, Going Back Surround on a PA Train license plate (In honor of Walt's love of trains); Mickey Dice and suction cup Sorcerer Mickey on his rear-view mirror; a Disney character steering wheel cover; and a Sorcerer Mickey antenna topper.
On his van he has Mickey, Goofy and Tigger stickers on a side window.
Our DS school car has an AKL License plate on the front, but he won't let us put anything on his Sports Car.
We Tinkified our DD's car for Christmas with a Steering Wheel Cover, Floor Mats and a CD holder. (Her cat ate a Flying Tink Suction cup

) Her Army/Police officer DH won't drive her car without threatening to stash everything in the trunk. We got him a Pirates of the Carribean sticker for his car.