Unless you purchase the higher end tv that morphs into a mirror or painting, there is not a lot you can do. How about an entertainment center with doors to close when not in use?
I think you are looking for this HOmetalk project:
You can frame 🖼 out using wood and create your own canvas, or use and existing piece of art work.
I would frame it with artwork, photographs. Use the same frame colour throughout. Then the TV will blend into the background.