We have a family member moving to NYC and I volunteered to make the cake for her going-away party. I thought about making a half-sheet with buttercream frosting and then putting a fondant skyline on top.

I've never worked with fondant before. Will the color of the fondant bleed onto the BC? What should I use for the windows of the building?

Any other NYC cake ideas?

Thanks!

if the icing is dry, the fondant should not bleed very much. you can cut out the windows, or to make it easy, use bits of white fondant for the windows.