WOOD FRAME WALL PANELS
Thin architrave wood that can flex to any imperfections in your wall is best. Draw the position of each panel in pencil on the wall then cut the wood to size. You’ll need a mitre saw for the corners.
Using a spirit level, start with the top piece, then attach side pieces loosely with glue. Wiggle them into place, before finishing with the bottom piece. Once you’re happy, use a nail gun to fix securely.
Wood filler can be used on any small gaps before painting.