Rocca Card Blocks distills the hexagonal-cards-as-cubes concept down to simply that: Each card represents a building block of one color or another (with intentional variations in the "finish" on the blocks, in order to add that visual authenticity). The backs of the cards are unpainted blocks, and the fronts are either white, blue, yellow, or red (15 of each), and one of each of those colors depicts the Rocca logo.
In addition to the "construction puzzles" offered in the game, the game also come with rules for Rocca Match, which is a derivative of a standard memory game. In Rocca Match, each player can only claim pairs that match and match her player color (a starting card). When you claim a pair of cards, "stack" them like blocks. An optional rule provides a twist: If two Rocca logos are revealed, everyone passes their claimed cards (and thus player color) to the left.