When you throw a baby shower, it's really great to get a nice theme going. I find the easiest way to do this is to find some baby shower clipart that looks great, but isn't too complicated.
On the other hand, vector graphic clipart can be enlarged without losing any distinctive form. It can be enlarged without becoming diluted but you need software that can import them. Vector graphics are used a lot for machine applications such as vinyl cutters, laser machines, CNC machines, etc. This is because the computer machine can follow the lines to cut the clipart out on something.
You might want to consider buying clipart as well, but free is more fun if you can find what you need. There will be clipart from Spiderman, the newspaper boy, Angels, and anything else you can conjure up. The colors and styles are endless, and only your creativity and the artist will limit you.