There are funny pictures all over the internet. You just want to be careful lifting them off of websites, because of copyright issues. Most photographers take a dim view of their work traveling without their knowledge-
It depends on what type of website you are working on- but you can always go to Google and do an image search
I have a few on the computer I can email to you. that is if you want them. A few animal theme'd one's. I can either e-mail or post them here. It's up to you.