I really like the micro greens idea.... easy and good. My thought BEFORE i heard that one was capers with little strips of scallion soaked in ice water until they curl
Do you ever see micro greens where you are? The super tiny ones, that come in a clam box at Whole Foods? They resemble this shape a bit. Or you could take some of the filling, change the color a bit and pipe it on with a small pastry tip. What's the sperm theme for?