From beautiful illustrations of shells to seahorses to many other sea creatures, and I think Alissa of 33 Shades of Green framed her printable art pictures beautifully.
I've actually mentioned free vintage printable before on Cabinet of Natural Curiosity. And if you need help on printing the art and formatting it to size scroll down to the end of that post.
Then, Emily grouped her Free Printable Art pictures around the TV set and kept everything black and white. Since the illustrations had different colorations online, she first saved the pictures to her computer and then brightened them and changed them to the same tone -she also chose the seahorse!