I have some moulding and scrap wood that I keep in a pile. I am not very thorough in photos for this project as I was simply trying something out to see if it would work. I am happy with the results, so I am sharing it with you.
I used wood glue to add the moulding scraps to 2 small pieces of scrap wood. I glued and nailed the 2 boards together.
I just kept piecing it together like a puzzle until I was happy with how the spaces were filled in. The boards are maybe 3" each to give you an idea. I painted it with some white diy chalk paint I had already mixed.
Here it is hanging up, it would look very nice with something on top, but I was rushing as usual.