Any WebGL 1.0 shadertoy should work in Natron. Unfortunately, since Shadertoy moved to WebGL 2.0 a few months ago, most new shaders need more modifications (such as texture2D->texture).You will find in the shadertoy presets dir many examples from shadertoy.com, which were then adapted for Natron. The Natron versions have "natron" in their filename.https://github.com/devernay/openfx-misc/tree/master/Shadertoy/presets/default
Will try them. Thanks for the info.
All the new presets should be available within 2 hours in the newest Natron snapshot