OESD Embroidery Online has several quilt borders including Christmas ones.
Take a look at Kimberbell background quilting - there are tons of sizes in their sets. NOTE: All of them are the same scale, regardless of the size of the stitch area - and I really like this way of doing quilting.
Designs by JUJU has lots of nice ones - go to their site and search for End to End Quilting and you will get many results. Hope you find what you are looking for!
I love JuJu's designs but all that I have found are larger than I need. I am hoping someone knows of a continuous line design with a narrow width.
You could try Designs by Sick. When searching look for continuous or endless border.
Thank you for the suggestion but the smallest looks like it will fill a 4x4 hoop. I need a maximum width of 1.5 inches.