We decided to paint high gloss epoxy like they often use on garage floors over our 30+year old Saltillo tiles in the kitchen and baths. It gives us the sleek contemporary look that goes along with all our other updates, is inexpensive, durable, and diy. It will certainly do until an all new kitchen makeover is in order.
SIMPLE and Awesome idea! Instead of using grout, just use thin strips of tile. You can stick these thin strips in between tiles just like you would when you lay the tile. Just cut the strips whatever size you need to go between. You can use different colors or patterns to give your floor a really unique look.