Another one that's not too exciting ... but a useful thing anyway! As someone with long hair I can confirm that it's mightily annoying to have your towel spontaneously unwrap and drop dripping hair everywhere.
We all have those towels that have seen better days, lost their "fluffiness" and are, frankly, only good for wiping dogs' feet.
This is quite a good way to use an old towel. Or you could use a nice new one, if you wanted to give it as a gift.
Measure - on the folded side - 23cm up and mark with chalk. Then measure 8cm in from that mark. Then measure 8cm down from the same mark (ie 15cm up from edge).
Then free-hand draw a curve from your inner mark to the outer edge of your towel (it should be about 60cms long).You can see on the left-hand side of this picture that I have made marks at 23cms from the finished edge, then 8cms down from that and 8cms in, and connected them in a curve.
Cut out the shape, and in the corner pin about 10cms of folded elastic .
Use your new overlocker *smile* or a zig-zag stitch around the curved edge.