Do it yourself refills for any plug-in air freshener. Less expensive and better for your health! plugin air fresheners (and tons of other stuff) have something called VOC in them. VOC stands for “volatile organic compounds” and they are highly toxic.
Attach a sheer curtain panel behind your existing curtains using a bungee cord. Just run the cord through your curtains, attach the bungee hooks to the sides of the rod and stretch it across, and voilà, you have a beautiful sheer inner curtain panel!