Buy luscious fabric remnants and layer them over surfaces. Put a collection of stones in a clear bowl with water to bring out their colors. Pile shells in one corner of the tub. Amass a bouquet of feathers in a clay pot. Gather a tabletop of different sized candles.
Group vases together, each with a single flower.
I'm no Martha Stewart, but I have found touches of nature look wonderful and are easy to do. Plus I feel better every time I pass by the bouquet of flowers sitting on the table. Visit beautiful things in museums, in nature, even in stores. Just to appreciate, not necessarily own. You'll be amazed how different you'll feel.