Here's a picture of lots of warts on somebody's foot. 

Here is a color drawing showing a large plantar wart on the bottom of a foot. Also on that site is a picture of a Wart (verruca) with a cutaneous horn on the toe.

Here is shown a large close up image of warts on the bottom of a foot.

Another large and clear picture of warts on a foot can be found here.

Here, you can see a photo of a cluster of warts on the side of a toe.

Here's another close up but kind of blurry picture of a wart on a foot.

And last, here is a picture of what is called a plantar wart on the heel of a foot.

All of those pictures were found with Google image search (in case you wanted to see more pictures of warts on feet).