I've mentioned Lauri Ward's books before: her motto is "use what you have." Frugal, green, and--believe it or not--quick. Her books--especially the first one, which remains the most useful--don't present beautiful pictures or fantasy environments a la Architectural Digest. Most of us couldn't afford the pillows in an AD spread, much less the Picasso gracing the wall.
So much of our mood depends upon our environment. Ward's blog is usually kind of meh, but I check back now and again. Her most recent post shows a room filled with furniture that is either the same as ours or worse! What a relief! Yet look how nice the room looks when the furniture is rearranged.
She explains how to rearrange in her first book. I followed her ideas and--no kidding--instant improvement.
Have you tried her techniques?