The first video shows diagonal rows of.. creatures, reminiscent maybe of crabs, or maybe flowers. They are pretty clearly visible once you repeat the video several times, and watch
the black empty spaces between color lines, instead of the lines themselves (much like Castaneda describes it).
The second one contains some intricate pattern or maybe letters, but still more like flowers. I was unable to make out any definite shapes.
The third one contains letters in the vertical columns. I could not make out enough to read a complete message, but certain letters, like R, S, or E in the left columns are pretty clearly visible after several repetitions. The largest fragment I could detect with enough certainty is ...ERS IS THE... in the leftmost column.
Disclaimer: absolutely clean, no psychedelic or other mind-altering substances.