1. Pirate treasure: Fox's Glacier Fruits lightly bashed in a freezer bag, then shaken in a sieve to get rid of dust & leaving only sparkling shards. Scatter and/or pile into a clumsy cuboid (made of RegalIce, see below) masquerading as a chest.
2. Icing to disguise/construct everything: SuperCook RegalIce ready to roll. Available from Budgen's and so presumably everywhere posher.
3. All four-year-old girls want a sponge cone with the top half of a Barbie sticking out the top. Ice cone & torso (as above) to represent ball dress.