Here's a quick way to make tiny gumpaste succulents that can be used to fill out a larger arrangement:
Start with a set of pointy cutters and cut out three shapes. These are daphne cutters but
you could also use small daisy cutters.
Pinch the leaves to thin them out.
Stack them using gum glue or water to attach them together.
Press a veining tool or the end of a paintbrush in the center of the stack.
Curve the leaves up around the stick, then "fluff" them to separate them a little if you need to.
Let them dry on a cookie sheet, they should keep their shape. If they start collapsing onto themselves the gumpaste might be too soft, so you can dry them in a bumpy mattress foam pad to keep their shape.