I'm sure that can be used in a shower, but what most will probably tell you is that smaller tiles such as those will look very busy. The larger the tile, the larger it will make your space look. Small glass mosaic tiles also tend to be very pricey which is why often times, they're used as accent pieces. In the very beginning stages of our remodel, I found it helpful to look through the books at Lowes and Borders to see what styles would work best and what materials were used and it was very helpful.