A collection view that is 3 cells wide and x cells tall, however randomly spread throughout i'd like a cell that is the size of 2 cells, see the image below

A collection view that is 3 cells wide and x cells tall, however randomly spread throughout i'd like a cell that is the size of 2 cells, see the image below

This will require a custom subclass of UICollectionViewLayout, which will manage both position and size of the items in the way you want.
Or you can get a layout somebody else already made, for example RFQuiltLayout: