I would make an "Old McDonald's Farm" quilt. I would use this as a backing ONLY for the quilt.
"Old McDonald's Farm" would need
1. House
2. Barn
3. Pasture with fence
4. Hen House
Normal things on the front of the quilt that belongs on a farm then this would be all the things for the farm. Don't have an actual pattern but you can find all of thes patterns on the internet as coloring paces. You can also take the pages to a copy place/public library and increas/reduce to the size you want. Good for kids and farmers.
Could also be a front (solid piece for an "I Spy" quilt. with a Pillow/case added for fun.
With 5 yards you could have several different objects.
Hope this helps with giving you some ideas.