Hi,
Thanks for the question. I'm not 100% sure of the end goal, but please see the file attached for a possible solution. There are two options you can pick from using the selector operator, either a pattern version that you can create using the Sequence operator, or a random version. If you are able to use the X and Y spline to set the ceiling size instead of a clipping area then I've also added a third option that allows you to use markers on the Y axis to choose the type of tiles.
I hope that helps,
Paul