There are thousand of quilting stencils out there. I would find a simple one that is not complicated. There wasn't much of a selection on Ebay. Depending on how wide your border is, there is this one.
http://www.ebay.com/itm/New-angle-ch...sAAOSw5VFWGBOE
I would just do the trees. Another suggestion might be to crosshatch the border. I did that on this quilt.