I suppose this doesn't qualify for "DIY" status but I love down inserts for sofa cushions and for sleeping. Unfortunately I find over time allergens accumulate in bed pillows. I blatantly disregard instructions and wash them in bleach and machine dry them. Well this only works so many times before their feathers begin to diminish and they just go flat. Rather than toss the flat sleeping pillows, they make wonderful decorative cushion inserts. And going from a standard size case to a 20" square, they look nice and fluffy in their new lives on the sofa. And for the DIY-ers, buying standard feather pillows from big box retailer is much cheaper than a specialized fabric or home goods store 20" or 18" pillow!