When I made my batch, I wasn't about to cut little circles and re-roll scraps, so I just cut the dough into rectangles and added the filling. Somehow I ended up with one mate-less rectangle, probably from my snacking on them, so I cut it into two triangles and added filling. No difference in taste! Luckily, my door was locked to keep out the circle police.
As for fillings, I tried almond butter and peanut butter and what I call lemon glop, which is a modification of a recipe previously posted here on BPL: 1 C nuts, 1 C honey, 1 C dates, 1 whole lemon. Grind it all up! I'm going to try leaving out the vanilla and adding another TB of cocoa in the crust recipe in my next batch.