Cabinet doors! I made these with 1/2" birch plywood for the middle and 1x3s for the frame. I've made cabinets before with 1x2s and they often crack when I screw them together since they're a little too thin.
Once I drilled all the pocket holes with my Kreg Jig, I laid them all out back side up to screw together.
Since the middle piece is 1/4" thinner than the frame pieces, I put a piece of 1/4" plywood under it so the back is all flush while drilling in place.
Ta-da! I'm turning these into tilt out cabinets to hold trash and recycling cans, so I also added some 1x12s to the back.