For this sandcastle I made sheet cakes for the base and then 12", 8"and 6" cakes for the castle part. Because the wedding was outside I covered the cake with fondant and then used piping gel to attach my "sand", I was afraid butter cream would melt and just make a big drippy mess. For the "sand" I used ground up vanilla wafers and edible gold glitter. The glitter really added to the realistic sand effect. I made chocolate shells and used chocolate rocks to sprinkle around the castle. The turrets are from the romantic castle cake set by wilton. I think it came out pretty great. The best part was that it was an easy cake to decorate. Any flaws in the fondant were just covered up with the "sand".