Stick magnets on the backs of photo frames to make their art look neat on the fridge.
Or raid your closet for clip hangers to save money on frames.
Hang curtain wire to easily clip up their most recent paintings.
Scan their paintings and shrink them down a few sizes to make a collaged poster.
Frame the art that color coordinates, then arrange them into a gallery wall.
Prop a DIY chalkboard on an easel so you can switch out the art on the regular.
Spray-paint clipboards to give your art wall a uniform look.
Upload pictures to a digital frame to keep a subtle slideshow on a side table, or even at your desk.
Glue on pretty borders to give the art a border without putting them in an actual frame.
And pin the art up on a cork board so that adding their newest masterpiece to the mix is a breeze.