Hi! I have lots of twistel - I have only used it twice so far, but I love it. I used yellow unwrapped, like you said, for sun rays - and I used green "as is" as flower stems with different other colors "as is" and bent them into petals for simple flowers such as daisies.
For adhesive on the unwrapped ones I used the Xyron, and for the "as is" ones I used MonoAqua. HTH.