You have to stick to the general shape / idea of what is in your square. You can;t just get rid of the "WE" in your square and make it an, idk, duck or something - 'cos it would defeat the object of the project.
As usual for me I submitted mine a bit late so hopefully those who haven't will be like me and suddenly remember to do it. I was pretty stuck on what to do so my square is a pretty boring one. Well it was nice to be part of it all.