Here is a welcome sign with a replaceable section to do an O in the middle. I drilled a 1.75in hole in the wood, well I used a chisel to make a 1.75" hole. I drilled in the back with a 2in bit and then glued a washer in the back of the hole. The pieces to go into the hole I put a big neodymium magnet inside under the wood and it clips in nicely to the hole. I ended up making the version for an 8 inch board, it includes a seahawks logo, snowflakes, tree, heart, Australian flag and a few other items. Including the 8in svg files on this.
That is really slick. I made a similar kind of thing for my mom. Whiteboard with chalkboard border and changeable “ornaments” Thanksgiving, Christmas, Birthday so far. I am kind of a deadbeat. I didn’t take a picture of it completed, and I haven’t made any more ornaments.