I re-use as much as I can (have always found it part of sewing), so I have used the "quilted bed cover (cleaned - they need to be replaced every couple of years), and my ironing board covers (cleaned also)" I make sure the ironing board cover is "silver side out", even when I cover it up. When making a pot holder I try to always have a "true", bottom. this way I can have the "silver side" of the ironing board cover face down. I always end up covering it up, due to stains. I use the bed cover to add a little more loft too.
Good luck!
Snooks