Don't use free clipart for your brand mascot. Think about it - do you want everyone else in the world using the same cartoon character you are? If you go the clipart route to save money, instead of having a custom character designed for you, be sure to go to one of the clipart developers that specialize in brand mascots so the character you choose is not in the public domain where anyone can use it for free. A good site for royalty free brand mascots is Toons4biz.com.
If you want to make your own baby shower clip art, software is available for just that purpose. Most software is easy to use, and can convert your pictures/snapshots into clipart quickly.
Independently owned restaurant owners such as pizza or Mexican restaurants need to be careful when they use clipart to promote their restaurant. Yes, it gives you an inexpensive solution, but it's easy to do more damage than good if you're not careful. After all, there is a reason why the big franchises pour so much money into their marketing.