Gemini dice have the splendid effect of two colors being swirled together.
Gamegenic: Candy-like Series RPG Dice Set (7 pcs) Black - Blackberry
Gamegenic: Glow Series RPG Dice Set (7 pcs) Blue - Icy Crumbs
Chessex Opaque Poly 7 Set: Light Purple/White
Dungeons & Dragons: Heavy Metal Realmspace D20 - Dice Set
Oakie Doakie Dice: (7) RPG Set Gemidice - Liquid Steel