The tile we chose was an HD stock item. I can be a little impatient when it comes to buying supplies, and prefer things carried in stock (this also makes dealing with miscalculations easier). We narrowed it down to two choices, all white octagonal with squares or white octagonal with black squares. I wasn't thrilled with either but compromised with a "peppered" floor. I cannibalized the black square tiles and artistically scattered them into the all white tiles. I prepped out the 1'x1' sheets beforehand by cutting out the tiles I wanted to replace so once it was down it would be easy to place the black tiles. I reused the loose octagonal tiles for the edges and odd spots and ended up with only 10 superfluous octo tiles, but a good number of white square tiles left over. The full sheets were to returned to HD.
I'm ready. Tiles are prepped, warming mat is taped down, floor is vacuumed, I'm ready. I mixed an obscene amount of mortar, determined to slap down half the floor in one sitting. Come to discover, filling in the areas between the wires on the mat takes a lot of material and I only got one and a half rows done. 4 1/2 full sheets. Only 29 sheets to go. Depressing. After 3 days and yet another trip to HD for yet another bag of mortar, it's down. The floor is tiled. I'm going to let the mortar set for about 6 days before grouting due to the thickness of it, plus, that puts it on a weekend and Wino is really good at grouting. It looks a little odd right now with the red and grey peeking between the tiles, but I think I'll like it once the white grout is in. I hope.