We had a baby Elmo theme for my daughter's first birthday. I got some of the plates & cups. Then I think I supplemented the plates & cups with just plain color coordinating ones for the adults, also just got a plain colored table cloth. We maybe had about 15-20 people, most of them were family which included a couple girls a little older than my daughter. You don't need a lot of little kids there for the first birthday. This party is more for the adults than for the little one! She won't remember it :)
I also went to Publix and got just a cake that was decorated with pink roses. They also made us a little round matching one for a "smash cake". Then we had some finger foods like chips, crackes, and I think a veggie plate. For the kids I also had little bags of Goldfish (3 different flavors).
Actually, you can see pics if you want haha http://baby.bestwd.com/photos.php?catid=12