I do love acrylic on a wall. It adds a real glow on what most people will have as a painted wall or tiles. 
These rather exceptional acrylic tiles are printed onto 5mm thick squares of acrylic (each being 210mm square) and this allows you to use them individually or as a group as pictured. They are surrealist images of the sea, as a cross section, with the Arran shape subtly laid over them. 
Each set of 4 (as shown) are provided with a protective cover which you peel off before using. There are wall fixers included. They are perfect for any indoor surface as long as it's flat and, being acrylic, they can be stuck to tiles.
The full set of 4 is £95, inc UK shipping and fixtures. Please allow 14 days for delivery.