I find inspiration from googling for pictures or you can do a search on here. I like the idea of the iron gate and my Mom made one like that many years ago but think it was from a kit. If I was near her I could look it up for you. I think you will find something. You did a beautiful job on the one for your church so you are very talented......Don't get discouraged.
If there is even a picture of something you can figure out a watercolor way to interpret it in a quilt such as some people have done portraits.