Hello, I am doing a cake this Saturday for a roller skating party. I made a fondant roller skate (flat) and am doing a 12inch square cake. I want to put a rainbow on the top of the cake. Anyone have any suggestions on how I should go about that? I was thinking fondant strips all accross, or should I do buttercream? I'm thinking the buttercream will be a big PITA with all the different colors. Also, I'm wondering if I should make the whole top a rainbow, or just some of the cake, the rollerskate will have to go on too. Any ideas? This is the invitation I am going off of.

http://www.etsy.com/listing/61400560/lets-roll-roller-skating-birthday-party

How about rainbow colored stripes all around the sides of the cake?

that's an idea, but it's the top of the cake that I'm having trouble coming up with a design to fit the invitation. If I do the whole top rainbow stripes, I worry it will be too busy because I have to lay the rollerskate on top of it.

How big is your skate? You could just do stripes in the center, all the way across, but narrower than the skate. So, the toe and the heel overlap the ends of the rainbow.

Whatever you decide to do, I imagine the base color of your cake should not be the same color as the skate.

Yes, I think you have to determine if enough rainbow shows. Try it on paper first. Don't be tempted to make the skate smaller than you had planned, though. I think it would look very nice, myself.

The skate is white and it's about 7" long and 5" inch. The wheels are red. I had orginally planned on doing rainbow strips of fondant to cover the whole cake ( it's 12" square) and then laying the skate on that. I just worry that will be too busy looking and the skate will get lost in the rainbow.

i kind of like the rainbow-on-sides idea! with the top you could put your skate, peace signs, funky flowers, and rainbow-coloured polka-dots to fit the invitation.

then it's loud, fun, matching, and not crazy busy.

Do an area of rainbow under where the skate will go so it matches the invitation, but leave a section without it to write happy birthday.

When you say rainbow stripes on the sides do you mean on the top of the cake but around the outer area of the square and then leave the inside a solid color....not white, for me to lay the rollerskate on?