When we lived in our old house, we had a little room called 'the spirit room'. What its original intent for itwas a place to store valuables without Ares(my son) breaking them. This concept meant so much to us, that we actually sacrificed having a bedroom(this room was my husband and I's bedroom; we took to sleeping on a mattress in the living room).When said items were loaded in, we quickly saw the potential for a 'temple' type set up, and proceeded to work from there. This room represented many different traditions, and served different purposes, all spiritual.
When we moved, the house had a few spare rooms. One was called a 'breakfast nook'. We have no need for a breakfast nook. This is where our new 'spirit room' is. Instead of representing all traditions, though, it represents mostly Hinduism, with a few Buddhas in there. There is a big bay window with plants(one that sometimes flowers, which we can offer during pujas). It gets a lot of use. Meditation, puja, japa. Sometimes just a moment or two of piece. Each wall is painted a different color and has pictures on it that represent that deity; Shiva's wall is white, Vishnu's yellow, Devi's red, and Surya's is the wall that has a bay window(the little wall there is is painted orange).
Off of our bedroom, there is another room which has been termed 'the green room', as its been painted green. This houses most of our Western oriented items that came out of the old 'spirit room' from the old house. It has a somewhat Masonic feel. There are lots of different things on display, and I have my Ares altar in there. Got some really neat antique furniture as well... looks like something from another time period. However, this room gets little use. Its purposes would be similar to the downstairs room, but other than occasionally meditating in there, I don't go in much other than to assure its in decent standing.
We are hoping to get an outdoor sanctuary up this year. We cleared the space for it late last fall. Not sure where to go with it, now that its finally getting warm enough to work!