The source above is not exactly a tutorial, but it gives you a basic idea of how the author built a Quirky Pallet Art to enhance the look of their old house. You can also find another tutorial at the link below. It shares a step by step procedure for making a wooden pallet sign. The final product is not exactly the same as the one above, but the basic idea is the same.
Plywood and long stock can also be a challenge to store in a shop. When I had an 8' bank of cabinets in my shop, I used to slide my sheet goods in behind it. Now that they are gone, I just stand them up against the wall and use a wedge system to keep them neat and upright. Long, narrow material goes on my lumber rack beside my table saw. I also store dry lumber standing on end in one corner of my bench room.
You can transfer a graphic on any wood piece of your choice, including a frame, top of a table, etc. The surface should be clean and big enough for the graphic paper. I am also sharing a video tutorial here that explains in detail the process of transferring any graphic to a wooden surface using a freezer paper. Just gather the items you need and follow this video to carve your favorite designs on your favorite wood items.