Here's the cake I made for my daughter's Frozen birthday. I ordered the figures & cake staircase (crystal, not white) online, then used rock candy (as seen on Pinterest) & upside down frosted ice cream cones with crushed rock candy sprinkled over top. It was a huge hit. I recommend not adding rock candy until last minute. I used rice krispy for the top layer, but even that had a hard time holding up to the heat of an outdoors party and the rock candy.