Wear an aqua blue top. To really get your costume looking right, try to get an aqua-blue hooded sweatshirt, t-shirt, or tank-top to turn into your Rainbow Dash costume. You don't really need to do anything to the shirt to make a costume out of it, just make sure it's the right color.
Kraft Vegemite Yeast Spread is a dark brown Australian food paste made from leftover brewers' yeast extract with various vegetable and spice additives developed by Cyril P. Callister in Melbourne, Victoria, in 1922.
A Vegemite sandwich to an Australian kid is the equivalent of a peanut butter and jelly sandwich to an American kid-but the taste is QUITE different! Vegemite is one of several yeast extract spreads sold in Australia.