I actually did something like this for a project and bought a pack of these in different colors from Home Depot.

[I bought something like these] (https://www.homedepot.com/p/HARDWOOD-REFLECTIONS-5-8-in-x-5-1-2-in-x-48-in-Rustic-Weathered-Grey-Pine-Solid-Wood-Wall-Paneling-1063CBDRG-20/305051723) to use for a propane fire pit build I'm making, but they are for wall decoration.

There are several different color options, the one I got was almost black, with some reds and browns to almost a blonde color and the pack came with like 8 or 10 boards.