Materials used:
MC: Stylecraft Special DK: 4 balls in Mushroom 1832
CC1: Wendy Aurora: 2 balls each in Electrons 5101 and Magma 5105; 1 ball in Galactic 5102
CC2: Wendy Aurora: 1 ball each Atmosphere 5100 and Ionosphere 5106

Tension:
Squares measure 5.5 cm across after 2 rounds; octagons measure 11 cm across after 4 rounds;
Tension is not critical for this project, but if your shapes are larger than mine you may need to purchase additional yarn.