This is the Admiral Daala costume that I'm making.
For the square on the pocket flap I simply cut out a piece of worbla in the shape I wanted, sligtly trapezoidal, and bent the edges inwards.
There is also a small groove at the top, and I got to that one by cutting a top layer of worbla that didn't quite go to the top, and then I added a separate strip of worbla at the top, so all in all the greeblie is in two layers.
For the long piece at the bottom of the flap I definitely thought it looked rounded, but with bevelled edges. I cut out three straight pieces of worbla in different lengths and layered them on top of each other. Then I cut the ends to make them more rounded, and finally I molded them over a big wooden spoon. Using baking sheets to make sure that the worbla didn't stick to the wood.
|Three layers of worbla, with rounded ends|
|Shape them over the spoon|
|Finished shape of the greeblies|