Sometimes the best thing is to take a sample of the tile if you can, or a picture to a tile showroom, for example Arizona Tile, Marrazzi, Daltile, and their reps can help you! They will look at the color and take you to what they feel will look the best with what you have.

Bet your farmhouse kitchen is cheerful and delightful! I'm curious what colors you have in the adjacent living room. Are there any fabrics or unique accent items you'd like to have more attention? Feel free to bring a pillow or quilt or pottery piece from the living room to your yellow tile to get a feel for what color might capture your heart. Will it be a mellow, blend-in kind of look? Or something that adds a "pop" to your rooms? Cant wait to hear your discoveries!

I love grey and yellow together, so I would go with that or something like white. What color are your cabinets? The above suggestions are great to take samples with you to a showroom, in addition to a tile and textile sample I would add a cabinet sample as well. That way as you are looking you have a whole palette to work with. Good luck and would love to see the yellow tiles, I love yellow!