I think this a wonderful idea not only is very nice and pretty but very functional. If for whatever reason you might want to redo with a different pattern or color, it wouldn't be a major project to change. I always like the option of being abel to change.

There are vinyl peel & stick tiles made specifically for grouting. They are a great option for people who want a "tile look" but their subfloor is not suitable for the issues involved with adding real tile. One example is TrafficMASTER Ceramica tiles sold at Home Depot. These vinyl tiles are thicker, more rigid and have a beveled edge designed for grout although they can be installed side by side without grout. Thinner vinyl tiles may not provide enough depth for grout to stay in. The grout is simply filling the gap between the tiles - it does not hold the tiles down! The number one issue is subfloor preparation. The subfloor must be flat and be clean plywood. The plywood should be primed with a latex primer to improve adhesion. And remember - If the subfloor flexes, the tiles will lift, the grout will crack or start popping out. While a vinyl grouted floor may not have the lifetime of real tile, it can be a great choice for those on a budget, those who like change or those whose subfloors are unsuitable for real tile.