How fun and thoughtful, baby showers are my favorite parties to plan.
Puffy paints worked great. I bet you will find lots of crafty women at the shower and for those not as gifted buy some stencils.
If you decide you want some shower games I have many ideas for them. One is the pacifier necklace made from life savers and jelly beans. They are so cute and look like pacifiers so if you want to know how to make them, let me know. You can hang them on a light fixture and give them to people as they walk in the door to wear as necklaces. Then you can play the game whoever says baby, or whoever crosses their legs, or something like that- the person catching them gets their necklace and whoever ends up with the most wins.
I also saw this at a shower recently where someone had purchased a scrap book and purchased all the supplies for making theme pages. So each ladies at the shower decorated a page i.e. Baby Shower page, coming home from the hospital, grandmother page, daddy and me page, mommy and me, and many other creative ideas. Then the mom could take it home and use it as the holiday or event comes up by placing the baby, family pictures inside. I thought it was so creative and fun. The ladies were able to use the stickers to write or markers to write something on the page.
I also saw where there were some beautifully decorated cards and each person was to take a card and write on it a piece of advice they would give to the new mother to be.
Something else, I'm sure you've heard this one - buy packages of thank you cards and as each guest arrives have them fill out their address so that the mom can just write the thank you and pop it in the envelope. After all when you are pregnant you are too tired to look up every address.
I know I have given you many more ideas than you asked for, I hope it helps.
For the bibs you could also buy preprinted ones that are for cross stitch or embroidery and give to any ladies you know of that know how to do this ahead of time so they can be done in time for the shower. Or you can use fabric paint on them too which is different from puffy paint. One other thing if you are good at doing dying or know someone who is you can do a station where they dye the onesies.
If you want to give everyone a laugh. Have someone either record or write down everything the mom to be says while she is opening gifts. It is hilarious read back. My friends mom did this and she was amazed at what she said, and how many times she said cool. We were all like yeah, that's one of your favorite words.