I love them all, they are very beautiful! All I can say is that condition will be everything in the future, keep them in good shape out of direct sunlight and away from fluorescent lighting, but still enjoy them on the wall and don't pack them away all the time. They should be enjoyed! In my opinion, they will probably have to be well over 100 years old to have any really good value. However, they would be priceless to me and real treasures if my grandmother made them. Also, put her name, approximate date made, city and state on the back of each one. An antique with provenance will have much better value than a nameless one. Pass them down and make sure the kids know how important they are, so they don't wind up disappearing at a yard sale.