Broken tiles are very versatile. They can be applied to curved surfaces or irregular shaped areas really well, and they create an easy-going, colorful look. The Architect Gaudi used the effect very well in his curved Guell Park benches (second image from the top.) Broken tile mosaics are also a great way to add color to life while preventing broken or cracked tiles from ending up in a landfill.
-See all posts on broken tiles here.
Top image from MerchantCircle.com, 2nd image from top is from BarcelonaCulture.com, and the bottom 2 images are from SmashingTimes.com