Consider getting a couple ottoman cubes that can be moved to the side when you aren't using them. I personally love a pop of fun color, especially with a large grey couch (blue, yellow, orange). Another option, that I actually have in my LR, is to use a bench instead of a coffee table or ottoman. The proportions would work better with the chaise on the end. Bench can serve as a table or a place to kick up your feet!