Where do you find images for your Hub posts?

One place that I recommend would be photobucket.com. It's all free and the only catch is that you have to become a member.

You have to make sure the pictures you use are copyright free or get permission to use them.

This hub gives some free sources:

http://hubpages.com/hub/Free-Photos-And-Stock-Phot

I get a lot of mine from the Wikipedia Commons too, the photographs connected to the articles are copyright free.

I take my own - it's easier an no one can lay claim to them later.

All over the net. You just go to google images and write what you want and appears many images.

In search panel of www.google.com search engine type the title of the image that is required, then click on "Images". Choose your image/photo from the thumbnail (sizes in pixel are mentioned below each image)