Absolutely love these!  I wanted to glam up my pantry, and these did the trick!  Super easy to install, just make sure you have the right glue.  Our went up over a 1978 popcorn ceiling.  We trimmed out the sides with a small trim. We are getting ready to install in a guest room and bath too with a larger more ornate trim around the ceiling.  We went with this tile because the styrofoam ones were not moisture-resistant but THESE ARE!  Love them!