DeBug your car – take a dryer sheet (used or not) get it wet and wring it out. Then wipe down the front of your car and the bugs come off. Simple as that.
Bug repellent – oddly enough there is more to this than just an old wives tale. Put a dryer sheet in your pocket and it wards off pests. Apparently there is a variant of citronella that is used in dryer sheets and it actually works.
Car air freshener – tuck one under the driver’s seat and it keep your car smelling fresh(er) for up to 3 months.
Hair de-tangler – rub a dryer sheet on your comb or brush before you use it and it will help make the nastiest of tangles come loose. Also, you can use a sheet if your get some flyaway hairs, just give a light wipe and you’re good to go.
Deodorant marks – Can’t seem to get that shirt on without getting white deodorant streaks somewhere? Wad up a sheet and with short quick strokes knock that out.
Vacuum bags – Want to freshen up the house? Next time you fire up that vacuum slip a dryer sheet into the bag and it will fill the room with its fresh scent.
Bathroom freshener – Next time you’re about to toss that used bounce sheet just slip it into the toilet paper roll in the bathroom. Every time somebody spins the roll it releases a fresh wave of fragrance.
Soap Scum remover – Dryer sheets easily remove built up soap scum off of your shower door. Just get them a little bit wet and, bonus, it makes your bathroom smell good and look good.
Swiffer substitute – You can use dryer sheet on your Swiffer (they’re a lot cheaper) or just use them to hand dust things. Something about the dryer sheets helps repel future dust from building up.
Cleaning up the kitchen – Whether it’s baked on a casserole dish or time to clean the oven racks, just put whatever needs cleaning to soak in warm water, a drop of dish soap, and a dryer sheet. Come back in a couple hours and whatever was built up should lift right off.
This merely scratches the surface of they can be used for. A quick google search turns up hundreds of ideas ranging from the practical (like running thread over a sheet to make sewing easier) to the crafty (like making tabletop Christmas tree decorations out of them)