The design you choose will have the best effect on that visual. Some designs incorporate both. Find a picture you like and post it? It's hard to get a feel for what your particular taste is. A picture of where you plan to put it and if it will be rectangular, square, etc. will also net you more comments.

I agree, sometimes mixing different colors and sizes of tile would add more interest to a small space.

thank you. i am not looking for interest. i am looking for an open airy feeling. thats why i am asking
about the size of the tiles. does it make a difference if they are smaller or larger? thank you