Here is what I did for my daughter's first birthday party. Hopefully it can be a source of inspiration.
I bought this set of printables on Esty at Belva June. She has so many adorable printables! I am just in love with how everything turned out.
For the banner I just added doilies and ribbon (When in doubt, add more bows!).
I folded some light blue card stock to make this hanging decoration for above the table
I made a ton of tissue paper pom-poms to hang from the ceiling. I ordered the tissue paper from amazon because I needed really big pieces to make really big pom-poms (they are much bigger than they seem in the pictures) along with smaller pom-poms. You can learn to make these here from Martha. The bonus with these is that they are now hanging in my daughter's room above her crib and they look adorable!
The cup cake toppers and wrappers looked darling with the pink icing and pearl sprinkles.