Well, if you could put a dot of that anglaise down then put a smaller dot of the in the middle of that you could have a few hearts on 3 sides of the plate. Will you have enough creme anglaise to cover the bottom of the plate?...place creme anglaise on plate and swirl around. Place various size dots of coulis and chocolate around on the sides, swipe with toothpicks to make the heart shapes.
You could also, as you mentioned earlier, make an outline leaf shape or even a tear drop shape with the chocolate and fill it in with a bit of coulis from a squirt bottle.
Or different size circles all over the plate using all three of these sauces - OR -
Graduating dots arching down one side of the plate, alternating the sauces.
I'm just brainstorming so don't shoot me