One of the page style I do for my Project Life is inserting a 12x12 layouts. I do this when I want to highlight an event or tell a story about the week. I also compensate this for a page layout that I do with a 12x12 photo collage from vacations.
Here is a quick 12x12 page that I did for my PL:
Here I have used BasicGrey's What's Up collection. It was perfect for our Singapore trip last summer. I adore the design of this line, it made embellishing the page much easier.