There are loads of lessons on the internet for paper plate pigs at differing levels of difficulty. Here's an easy one: http://www.notimeforflashcards.com/2008/05/were-you-born-in-a-barn.html
My former Grade 1 class made these. Start off with some paper plates and cut out egg carton sections for the snouts.
Then the kids painted them all in tempera and I hot glued the snouts in the middle. As you can see by the colours, my kids were very 'creative' ha! ha!
Let dry and then the kids cut out and glue on ears, tail, feet, and added googly eyes.
Lastly, I varnished them all so they were nice and shiny.