Press pretty fall leaves and display them in vintage frames.
Unify different frames by painting them white or gold, then wrap any existing mats with linen in earthy neutral tones. (Wrap the linen snugly around the mats and secure at back with glue or double-sided tape. Then, cut an X from corner to corner across the picture opening and fold the resulting triangles of fabric back and affix to the mat.)
See more fall decorating ideas in our photo gallery.