Wooden Mats

I made a few calls about cutting these fancy designs in mat board, and apparently they want 30-100 bucks, just for the board, which is too pricy.  It'd be easier for me to get a knife edge blade, and cut into foam core or mat board, with a jig saw,

Or to use wooden sheets, and a smooth cutting jig saw blade. I could get some stencils or ornament to go around it if I wanted.