How to make a Barn Wood effect. Start with new wood. Then with the paintbrush, paint a layer of water and then a layer of stain and rub it off quickly with a rag to get that gray color. The water keeps the stain from getting too far in the wood so it’ll be gray not black.
DIY Faux “Barn Wood” Wall Art
Instead of house numbers, maybe do child's initial with D.O.B. (although I like the house # idea too...)