Mozaa

From BoardGameGeek:

Mozaa is a tile laying game, consisting of 64 square, unique colored tiles. There are 3 different rule sets included. The base game lets each player put down tiles and score points for completed color fields. These fields are completed when all open edges of a area are closed with an adjacent tile. To close an edge you need a tile with a single triangular area to that edge. Sand clock shapes are not considered connected. The first rules variant lets each player choose a color and only score points for completed fields in that color. The second variant lets you claim uncompleted areas by placing a marker (not included) before they are completed and scored. In each variant you have a different number of tiles in your hand, enhancing the strategical aspect of the game(s).