What, no love for obsidian floors? I always use an obsidian floor with a stone border in my "fancy" rooms any time I'm making a castle or something. They look rather silly in a log cabin though. :wink.gif:
A checkerboard design is the way to go. What block you use depends on the rest of the room though. Using colors that work well with the "theme" of your house will do good.
If you have a rather plain style house, for example, use similar colors.