Instancing / Vector Sempling / Image sempling

Hello,

I saw a lot of definitions where circles or polygons are populated on the grid, and than manipuated by the atractor points or by the image sempler.

That is working fine, but I would like to sample custum shapes [vectors from illustrator or maybe even images], but how to sample the same object over the grid if it hasn’t have point that defines it’s centar? I wonder if there is some known method of puting custum shapes into some kind of placeholder.. Can you help?

Thanx,

svemir