The big square ones in the back are my recent purchase. The bed is still very much a work in progress. I still want to get rid of the blue pillow and get some other assorted white pillows. My next few purchases will be singles, rather than pairs because right now I think it look a little too weirdly matched. I might substitute out one of the middle-sized white ones at some point as well to make it look intentionally mis-matched. My goal is for them all to be white, but to have lots of different textures and patterns to add interest. I think I might need to get another large square one- probably for in the middle of the bed- so you don't have that gap.
This picture shows the texture and pattern. They are also really comfortable and perfect for back support when I am reading or watching something on my computer. While looking at the overall picture still sort of overwhelms me- I'm really happy with the progress that is slowly being made and I think these pillows were a really important step.