Use and abuse your season!!! Haha. Wine colours, pumpkins, squash, leaves, golds, rose golds... Don't worry about overplaying your theme/season! I loooove fall colours, so warm, cozy and fun. Candles and soft uplighting are also great for fall.
I'm having a winter wedding and I'm going dark and sparkly. Also, my favours will most likely be hot chocolate mixes (clear cones with mix, chocolate chips & mini marshmallows)... also totally appropriate for fall if you haven't picked a favour yet!