Here is a peak of their invitation :) My mom, Hubby, and I were saying that it looks like they're just popping out of the card welcoming everyone to come have some party fun! :)
Decorations: Colors of the party: Orange, Light Blue, Yellow, Light Green, Red
I'm going to make the cake, we'll have lots of food, my Mom is going to make her watermelon fruit bowl in the shape of a car this time!, I have party color candy, party color polka dot ribbon but contemplating dots vs. no dots, 2 bins in party colors for drinks, drink dispenser and pitchers for punch and water (with ribbon to decorate them with of course ;)), party favor bag with goodies...
I'm open to any other ideas or inspiration for a cute car party! :)