Hey Josh, my favorite scheme is the Faygo...love the turquoise and white! I will have one someday.
However, if her favorite is Pepsi, then I would make the first machine in the house her favorite! Might allow for more in the future!
The 2-tone blue and white would look great, and so would solid blue (like Signguy's Barq's avitar). As BrianB said...keep the peace! I'm trying to get a small cooler now to do in Brandie's favorite...Sun Drop. It goes a long way!