The bride's gown was candlelight in color, so that's what color the buttercream was. The bride and I bounced around ideas and it was decided that they would have a shell-strewn, sandcastle-inspired cake, since the ceremony was scheduled to be on the beach, at the water's edge. There was very little color at the front of the reception room when we arrived, save for a coral colored drapery panel where the cake was to sit on an elevated table. We ended up putting 'sand' (finely crushed graham crackers and Nilla wafers) on each tier to help differentiate them and to showcase some of the neutral and blue shells that were selected. I should qualify by saying that we didn't use all of the shells I'd made but I wanted to have plenty to choose from, plus I needed to account for breakage during transport. The cake itself had a lot of imperfections but the bride and groom were happy with it. Vanilla top and bottom tier. Chocolate center tier.
The couple is very happy--married last year--and I've since gone on to make them a baby shower cake. :)