One of our favorite games at that age was Mama in the Middle (I have twins, but it would work with one, too!). We'd like on our backs on the floor, and I'd put a big, but soft, ball or stuffed animal on/between my feet and hoist it in the air. Sometimes I'd bounce it a little, or sometimes we'd count to three and then let it fall down on top of us. Just sticking our hands and feet in the air and then shaking them all around was fun, too, as was reading books in the air while being in this position. I think it made the babies feel better about spending so much time on their backs.
I'm also a fan of "Comin' to Get Ya," where I'd put the baby on one side of the room and slowly crawl over on my hands and knees while saying with great anticipation, "I'm comin' to get ya!" Once you get to him, lots of tickles and giggles finish the show.
The only down side I found to these and other games at that age was they typically only provided a few minutes' distraction at a time.