Personally I don't consider summer over until the end of September. So I'll be waiting until then to implement some of these changes, but based on where you are you may be able to get started sooner.
Candles. Make a candle vignette for your dining room table. Light them every night at dinner. Have fun picking out some candles and holders you really love and love looking at every evening. Unscented is best. I place mine on a mirrored tray for added light.
Throws. Nothing says comfy to me like a chunky wool or FAUX fur throw.
via A Touch of Luxe
via Tip Junkie
Textured pillows. You don't really want to pile up the fuzzy pillows during summer, but fall is a great time to start putting out your textured pillows. I've been wanting a mongolian lamb pillow for a while now.
Tom Scheerer Decorates is an absolute feast for the eyes. I didn't want it to end and will be pouring over it often this fall and winter. I'll be sharing more from it later.
via Amazon