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).