I am merely providing you with a tool to generate an infinite array of unique, and strangely Dali-esque, cactii models. What you choose to do with that information is up to you.
For more information about growing your own unique foliage using OpenSCAD, please check out my Instructable at http://www.instructables.com/id/Procedurally-Generated-Trees/
(There's still a few days left to vote for it in the 3D printing Instructables contest!)
If you just want to make a unique cactus in Customizer without worrying about the nitty gritty details, just know that the most important variable to change is the seed. The seed determines what pseudo-random values are chosen and thus the overall shape of your cactus.