a field is generated, and filled with noise, then set aside.

a new field is generated.

a dotgrid (with occasional lines) is added.

a circle or square is drawn.

a shader is applied; it relies on the noise field for randomization, and various values determine its output.

a border is applied, and a vignette is stippled.

the result is presented to the viewer, who can press "s" to save a 2000 x 2000 png.

please note that there can some minor variation in how the preview is drawn versus how your computer renders the live view. (in general, this will be most obvious in the live view having more contrast.) this is an artifact of using a glsl shader for the majority of the view. the saved png output will be identical to the live view, however.