cycles voronoi trasp.

i’m creating this:

at first i Thought simple! all i need to do is create a plane, mix node, transparent, diffuse, colour ramp(constant) ad done! but it did not work, it was all in circles, how do i do it? (how do i make it to straight lines?)
i was thinkin on th lines of voeonoi cells, but how do i do that in cycles material?
and in the process, i found this website