Here is the card that I sent to my neighbor who just moved away. (Irene, if you haven’t gotten this, check your mailbox!)
I used a Koh-I-Noor French Curve template from my (old!) Engineering Graphics supply pouch to create the curves that became the rolling hills.
Supplies: Stamps – Stampin’ Up!, paper – Papertrey Ink White, Stampin’ Up! Bashful Blue (retired), Basic Gray, Certainly Celery (retired), inks – Copic R89, Stampin’ Up! Bashful Blue (retired), Certainly Celery (retired), Smoky Slate, VersaFine Onyx Black, dies – Memory Box (clouds), Spellbinders (oval), Stampin’ Up! (banner), embossing powder – Filigree Fine Art Powder, organdy ribbon – ClearBags.
Paper and Ink Imaginings 
September 16, 2013 at 12:53 pm
On my goodness, I have something similar from my quilting days! Will totally have to dust that off. Thanks for sharing your cute card.
September 16, 2013 at 1:02 pm
It’s amazing how many things we all have around the house that can work for multiple crafts/tasks! Thanks for stopping by!
September 16, 2013 at 5:35 pm
It also has dressmaking applications.
September 16, 2013 at 6:10 pm
Terry, I pull the curve out every month or so and use it. Some of the paper craft companies are selling dies to cut the same curve. I think my solution is cheaper. (If I needed to mass produce a card with a curved landscape, I can see the value of a die.)