what size are the Picture Frames?

I am not the decorator but the picture frames appear to be 8x8 or 10x10. Finding artwork for multiple frames with the same style and genre is sometimes easiestly done by purchasing a book. The big illustrative type. I know there is one of ocean animals and flora that is all created by the same artist. Not positive of the legality but you could also take all of the artwork from a single artist and make monotone prints for cohesiveness.

Here is a popular one done by Taschen http://www.bing.com/images/search?q=coffee%20table%20book%20red%20coral&qs=n&form=QBIR&pq=coffee%20table%20book%20red%20coral&sc=0-21&sp=-1&sk=#view=detail&id=9A42FDDD776E99444E3DE4E66C9721D3C30C49A7&selectedIndex=2

This might be perfect for a more modern room http://smile.amazon.com/Secret-Art-Dr-Seuss/dp/0679434488/ref=sr_1_5?ie=UTF8&qid=1418764298&sr=8-5&keywords=coffee-table%2520books

a more modern room could use Seuss http://smile.amazon.com/Secret-Art-Dr-Seuss/dp/0679434488/ref=sr_1_5?ie=UTF8&qid=1418764298&sr=8-5&keywords=coffee-table%2520books