Drag the sliders around and watch the patterns that are created by the moving clones. Displacement adjusts how far the clones move per frame. Rotation_1 adjusts the rotation after a new clone is made. Rotation_2 adjusts how much a clone rotates per frame. Costume adjusts which costume is used. Color adjusts the color (duh). Size adjusts the size (duh).
All by me in only 19 blocks of code! Post the best patterns in the comments! Also, changing the rotation_2 or displacement by large amounts can bring a lot of extra fun into the patterns.