Simple skend effect, optimized for the typical usage case of swaying foliage/grass.
This effect should work w/ color, opacity and with multiple effects.
Rotating with color, opacity and effects will change the orientation of the skend.
There is another skend effect that I worked on with skymen below that has more control for the angle of the skend and works better with rotating the sprite. The perf seems about the same, but the other one requires more control over angles, etc.
construct.net/en/make-games/addons/44/skendpow