A Nanobot Ice Cube. Made of a hard acrylic compound, the iridescent effect was created by using a coloured material under the cube.
The focus of the notorious ERIS villains was the destructible devices called Nanobots that were created by Natalie's (Hilary Duff) father.
The Nanobots were encased in "ice cubes" and these were featured very prominently in the movie, particularly during the latter part of the film at the ERIS secret hideout.
* COA: Movie Prop Warehouse.
