Jack and Theo are too old for numbers and letters like these (too "baby") but other styles of magnets will be great. Have magnet sheets from old starbucks signage for craft project with boys. Found some cool metal sheets from shop salvage to hang on wall.
Love this idea for a home. Kids need to know they can get creative without getting in trouble, and hanging their art is always fun for them and mom! -- Art central = chalkboard, a place to hang the kids' art by binder clips, frame more of their art, magnet board and a corkboard, from many saved corks, to hold invitations.
Mag Chalkboard Paint: Paint a wall, have some craft activities to have her make castle/house/outdoors/etc pieces (modular ideas so she can build the castle in many different configurations). Also could use chalk to outline and draw.
Make Your Wall Magnetic for an Awesome Way to Show Off Photos