Most individually packaged patterns will have multiple sizes. If you have a quilt shop near you, you could browse there. Most quilting magazines will have different quilts in different sizes. They may not have a single quilt in multiple sizes, but within the same issue they will have different quilts in different sizes. Again, a browsing opportunity.
Finally, you can always use a smaller quilt on a bigger bed! Here's a discussion from earlier today:
http://www.quiltingboard.com/main-f1...s-t261231.html