I realize it's not exactly the garden you were expecting, but it is winter, and snowing outside. The room in this photo was a natural for a garden room, as it came with two walls of windows and a floor tiled in a deep forest green. Unfortunately, it also has a northern exposure, which doesn't make it ideal for many plants. Right now, it holds three huge brugmansias, two crinum, a freesia and assorted houseplants anyway, as my house doesn't have all that many good windows. With the rattan furniture and a concrete garden bench used as a coffee table it does feel a bit like being in a garden.
Any room can be a garden.
Take my dining room. When we moved in, it looked a lot like a cave. Gorgeous wallpaper, but magnolias floating on a charcoal gray background don't help the lighting situation when the room is 25 feet long with only one widow at the far end. We started with a nice picture of a garden and an overhead projector. I projected that picture onto the lower walls, penciled it in, then painted a garden of spring flowers.