I painted my ladder in a nice bright red to accent the room -but, if you plan to use the ladder as a ladder again, you shouldn't paint it. You want to be able to spot any structural defects when you're using a ladder.
Set the ladder up so it will sit sideways against the wall. Make sure that your side supports are securely locked in place.
You want your shelves long enough so that they rest on both a step and a back support wrung.
You can make them all the same length or stagger them so that they mimic the shape of the ladder.
Once you have shelves, simply slide them through the ladder rungs so that they rest on the step and the back support.
That's all there is to it... instant storage space with personality! I'm Mrs. Fixit and it's just that simple!