This over the door hanger from amazon cost about $11 and is the most functional organizational tool I have ever used. We have them in our pantry for snacks, bathrooms for odds and ends and in the kids closets for small toys. Over time I hope to add more shelves and better utilize the walls with hooks.
My husband also installed an art wall at the top of the stairs using a curtain hanging system from Ikea. I like how this really highlights the childrens' art work in a special way and keeps my fridge clutter free.