In all seriousness, perhaps a little more substance to the original question? My gold is disguised here ->
Is say trying to make it look like something else would be tough due to its weight. Maybe plastic coating or rubber coating? Is say hiding or camouflage is best.
leave it out in the open, like as a door stopper or something. ppl will think it's just an imitation toy.
Go down to Games Workshop, buy the molds for making miniature lead war-games figures, melt and pour gold into molds. Have a solid gold goblin army, give it a really bad paint job so no one will want to nick it. Never take them down to Games Workshop to play with. Basically, hide the shape, hide the colour. If it looks like an ingot or a coin it will be nicked. If it is shiney or gold coloured it will be nicked. Of course when you want to sell the gold just melt your army, the paint will burn off, probably.