When I bought mine I couldn't decide between a 2x2 or 1x1 checker. The main portion of my shop is 40'x55' so I thought the 1x1 checker may be too small, but there are alot of odd angles in my building so I figured it would make those less noticeable. I needed the same tiles either way, so I just went ahead and ordered them like you did. I decided that I was going to do the 1x1 pattern, but the tiles were shipped in 2x2 groups. I started to break a few apart and decided it wasn't worth the effort to seperate all those tiles, so I ended up with a 2x2. I am real happy with the results, but either would have looked nice.
Have you seen the RaceDeck tiles in person yet? All the colors you bought, except for the black should have a little bit of a metallic look to them. I think it makes them look alot sharper than if it was just a plain solid color.