I often use repetition in my art in all the layers. In the final layer it is obvious as I repeat a series of pixel shapes and dashes in different parts of the canvas, for example in the image to the right (click to get a full sized view).
And art is a great way to unify a room for example by including objects that have the same design as the art in a frame on the wall. Many print on demand services, such as Redbubble, Zazzle, Society6, facilitate this really well by providing the same design across a range of objects that would be at home in any room. On the shop I sell a range of cushions that match the art elsewhere on the shop. I also make coasters and magnetic bookmarks with these designs so if you like a design you could get it repeated in a few different places. And don’t forget I can create custom art which you could also repeat around your house and help create that sense of unity too.
Hope this has been interesting.
Hugs, Ceri xx