Does anyone know if you can use the "upside down" frosting technique for a smooth top and end up with 1 color on "top" of cake and 1 color on sides? I want a white-topped cake with pink sides. How to do without corrupting the colors??

I've done this with a dark chocolate frosting on top and a milk chocolate on the sides. I frosted the circle with the dark then built my cake upside down just the the instructions direct. Then I used the milk chocolate on the sides. When you flip it over you will see where the two colors "join" together. On mine I simply piped a border over it. If you look in my cake photos it's the "Willow Tree Wedding" cake but you can't really see the top of the cake because of the angle of the picture. It did work out well though. HTH

I've done this with a dark chocolate frosting on top and a milk chocolate on the sides. I frosted the circle with the dark then built my cake upside down just the the instructions direct. Then I used the milk chocolate on the sides. When you flip it over you will see where the two colors "join" together. On mine I simply piped a border over it. If you look in my cake photos it's the "Willow Tree Wedding" cake but you can't really see the top of the cake because of the angle of the picture. It did work out well though. HTH

one more question........can you do the "upside-down" technique with wax paper or only parchment?

I happened to have parchment so I didn't try it with wax paper. The only thing I would say regardless of what you use is make sure it's taped tightly or you will get wrinkles when you frost it. HTH