I ordered the tile for my kitchen backsplash today - 3x6" milk chocolate matte subway tiles - and am now wondering if I can get away with not using grout when I put them up. The sample board (see below) had them butted right up against each other, and I really like how it looks, but I'm not sure what role the grout plays in the whole tiling scheme of things. Is it to keep the tiles from shifting? Does it work as an adhesive? Is it purely decorative? I've searched pages of google results, and really didn't get a definitive answer. If I have to grout, I will, but one less step sounds good to me!
Also, am I crazy for trying to do the tiling myself? I'm a little nervous about having to use a wet saw to notch the tiles around the receptacles - if I can even find one to rent!