Came across a website recently that has "loads" of sketches for you to choose from. It's called Pagemaps.com (don't forget the 's' otherwise you get a street map website lol! - use the link it's easier!)
There are some sample layouts with some of the sketches, and there are various sizes catered for.
I especially like the Circular page layout sketches - very different.
And it is one of the few sites which actually gives you some sketches for tags AND cards!
Check it out.