If you're a little less sophisticated woodworker, you will likely take advantage of some of the many kits that are available where you assemble your guitar from parts that are already precut and ready to assemble.
Instead, cut them as you go, because your walls may not be even all the way around and you may find your precut tiles don't fit or are too small, leaving a large gap between the tile and the wall.
Once you have created your label, you can print the labels on your color printer or take one down to your local copy store and have it color-copied on sheets of paper or precut labels.
Quality paper and shape for origami: Some people enjoy dollar bill origami because money is printed on quality, sturdy paper that is precut and easy to fold.
To simplify the process, consider drawing the label on a sheet of precut labels that can then be copied on a color copier - no cutting or gluing required.