I think, if you would want to re-create the patterns (i'm talking open eye visuals here), you ought to analyze the human visual system (or maybe even just a proposed visual system) down to basic functions. Than you would have to try different variations in alterations of the scale in wich some functions occur in relation to eachother.

For instance; if you would analyze the visual system down to a system that sees colours and a system that sees contrasts, you could try whether you get something that looks DMT-like by varying in the relation between those two systems; one of the two slightly delayed compared to the other or slightly spatially shifted. The more it looks DMT-like, the more you know you're looking in the right direction so you know wich type of alteration you need to specify.

You need a computer to do this ofcourse.

Or you should just practice your paintig or drawing skills a lot, like M.C.Escher and Alex Grey did.