Y'all LOOK he loves me!! He got BLING!! And that is SOME BLING!! WOWZER! As for size I like the one you show and 1x2 over the 1x1.
Now get some paint chip cards to help pick out the mortar color you like the best. Get white, off white, soft gray, and dark gray. Each one will really change how the tile ends up looking THEN get the grout sticks to find the grout color you want to use. White will make each tile pop while gray will make them blend in together more. There is no wrong answer. Just pick what you like and it will all be good!
Kim