These were cut out with my Ryobi jigsaw from 150x18 pine. Have a short block of 20-30 mm pine dowel and 6mmx50mm hanger bolts (pictured) glued with araldite into the dowel.
they can be hand screwed into dry wall with an anchor or into a hole in timber 4.5 -5 mm dia.
paint in colours you like and make the shape as big or bold as you like - the plus signs are the most popular
i made some 150x150 plus signs finished in black satin rustoleum for a modern yoga studio in their changing rooms

