I have always been careful not to spend much on decor, especially seasonal decor (except Christmas- lol). I buy things that aren't trendy so that they last and last. I thrift and search at antique stores. I love to use things in our yard- pine cones, twigs, flowers, acorns, etc. Simply moving things I have in my home around or into another room changes things up. Candles and simmer pots on the stove are thrifty ways to bring in some cozy. Buy good pillow inserts and swap out pillow covers. You can find cheap ones online.