Pillow manufacturers suggest that you switch your synthetic-filled pillow approximately every one to two years. Not only do pillows lose their shape and firmness over time, but they also accumulate dust mites, mould and bacteria. Your first instinct might be to toss old pillows in the trash, and rightfully so if you've had them for a number of years. But if you've had your pillows for no more than a couple of years and you've used pillow protectors, there are a number of ways you can recycle and reuse them.
Reuse the stuffing of the pillow to make your own throw pillows for other areas of your home. If you like to sew, you can use some fabric and the stuffing from the inside of a few bed pillows to make a fluffy, overstuffed accent pillow for your couch or love seat.
Downgrade your pillow to a pet bed. You can simply put on a new pillowcase suitable for your pet to sleep on, or you can make an entirely new cover with fleece fabric that's been cut and knotted around the edges.
Place two very flattened pillows into one pillowcase to create a thicker, firmer pillow.
Sew together a number of flattened pillows to create a warm, thick comforter. Place your comforter in a nice duvet cover.
Fill your child's flattened stuffed animals or dog's torn stuffed toys with filling from the pillows.
Tuck pillows on the sides of boxes when packing and moving items. You can even use the filling as packing material when shipping items.
You should always wash pillows before recycling or reusing them.