Usually a custom window treatment is hard to change with the seasons, but the cuff that is added to these panels could be replaced with holiday colors. Choose a solid color for the panels and you could add these pointed cuffs in fall holiday colors. They just hook into the same ring the panels hook into. And the tassel can make a fun addition to the cuffs.
The straight panels have a contrast band on the cuff so you could use Christmas red and green with a combination tassel or an ivory cuff with banding in the red or the green. You even could make these reversible with the ivory base and russet colors for Thanksgiving as the banding.
The picture with the tie back panels is just an example of the cuff with no banding. The tassel really helps put the finishing touch on the point of the cuff. Summertime? Take the cuff off entirely for a summer, light look.