All you need is a square piece of wood to act as the base and two small pieces jutting out to either side.
You might not find a simpler DIY project on this list. All you need is a square piece of wood to act as the base and two small pieces jutting out to either side. With a couple of screws to connect the pieces and a few more to anchor it to the wall, you can have an out-of-the-way space to place your ironing board until you need it next.