In or Out?

I'm trying to teach myself ImageBlender. Not the most intuitive app on the block but useful for certain kinds of collages.  Good thing we have YouTube videos at our disposal. These are four of my photos from a Texture series for a group challenge called Containers that I am participating in. Learning to use masks and modes. There are other apps that do similar things, but it never hurts to have another tool. Not sure where this is going, but it is certainly an engaging process.