This isnt nearly as confusing as it sounds. If you have tile in your home then you know all about grout. What if you could fill in the spaces between your tiles without having to mix and apply grout? Well, you can and it leaves you with a very beautiful and unique look on your floor.
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.
The next time you think about replacing that old tile, think about a new way to update your floors. Instead of adding grout between the tiles, just add a contrasting color of tile. This may also work for bathroom walls if you have tile in there. Have fun with it and be as creative as you want.