I would also like a nice leather made cover to go along with it.
Check out the selection:
Leather Notebook Covers, Handmade by Popov Leather
The right notebook is like a good friend: reliable, helpful, and always there when you need it. Our covers elevate your favorite notebook to have all those qualities and more. Keep everything you need close to your notebook and close to your heart.
www.popovleather.com
As for a cover, something that will Show age as it is used.
The English Tan leather would be the best for developing and showing age/patina.