For me, the best media of showcasing my favorite design/illustration/painting/photography is prints, it might be a little odd fashioned but I prefer my walls to be plain to bring in more light (so sorry wallpapers) and I prefer the fabric on my furniture to be plain too, but at the same time I love patterns and colours. Quite a contradiction isn't it, so prints are my saviors! Plus, not all designs are available as wallpaper, bedding etc, but you can pretty much always get them as a print!
1. Airport 2. Flamboyant Forrest 3. Falling in Love Poster 4. Public Bath
and I love this one by Present&Correct,
(images from Design Supremo)