This LEGO Minifigure Ice Cube tray looks like a bit of fun. It’s silicone so getting the pesky blighters out should be easy. If you’re really clever you could stick two halves together and make fat, double-sided minifigures. Or minifigure candles, or chocolates or whatever else you can pour into silicone moulds; ABS, cement, molten lead? Whaatever, you can pick one up from the LEGO shop for about US$7.99.
Keep cool with LEGO minifigure ice cubes! / Makes 8 minifigure-shaped ice cubes at once / Constructed of silicone