Matrix Tiling?

I've been working with matrixctrl as the basis of a monome style step sequencer, using metros and counters to drive it all. I made it so on certain beats it randomly plugs dots into the matrix, I've hooked it up to another patch that lets me change the notes it triggers to different modes and root notes. It makes a constantly changing pattern, and every now and then it actually sounds musical, but I'd like to make it a little more advanced.

SO, I'm trying to work towards some kind of self reference system. I'd like to be able to grab the first quarter of all the columns, and tile them across the remaining three quarters. From there, I could implement a similar set of subpatches to my current randomizer to keep it interesting, but maintain some kind of order so the ear could actually follow it.

I'm familiar with the basic commands for matrixctrl, getrow/column, and the formatting of the lists, but I'm not sure where to start with this. Any suggestions?