Buy enough wood for the size shelf you want.
I used 3/4" x 4" pieces for the border and shelves and then picked out wood trim with a cute design for the front of the shelves. I used particle board with a white finish for the backing. Buy a wood stain color that you like.
I measured and cut the pieces for the size I wanted then stained all the wood. Once it was all dry I began putting it together with screws, I used small wood paneling nails to secure the trim on the front.
I added hooks to the back so it can be hung on the wall.
You can make it as big or small as you want.