What happens if you take not-quite complementary colour pens, hold them a finger apart and at the same time, and draw anything!? Something a bit 3D ! The third picture here, of the pepper grinder, was drawn with complementary colours and doesn’t have quite the same effect. Fun though!
Although the effect was accidental when I sat down to do some drawing, it is an example of the push-pull theory of colour highlighted by Hans Hofmann, whereby you can create depth and movement just with colours themselves, quite apart from any other the other elements of art.
I used the simple element of line, with colour pens, et voila!