This is the design I used for the trial run of painting trumpet vines, on the tile below.
This design was from a plate painted by Celeste McCall (www.chatty teachers and artists). I loved the design so much I decided not to add nor delete from that which she had painted. So all credit to Celeste for her eye of design!
My background went from Royal Plum at the top, then into Blue Violet, blue and then the palest of greeens at the bottom. I decided to leave the fancy cut out border white, to give the trumpet vines space to "breathe".