I absolutely love this idea. Your children are growing up and it may be hard for you to throw their old bed. Rather than stowing it away in an attic, because you just can't part with
it, re-purpose it into a fabulous bench! This can be done with any size bed, but is probably easiest with a twin. Use the headboard as the back of your bench and then cut the footboard to make the both sides. Build the bench part in and . . . voila! A great re-purposed heirloom.