I just typed in 'sheep with bunny ears' in google images. To my great shock and astonishment, a picture actually showed up! I had to resize it. I got the 'teacher' sheep from www.worth1000.com
. If you have a few minutes, take a look at some of the pictures there--hilarious!
So find a picture you like, and then make it small enough. I find that's the toughest part, put I make a thumbnail and then play with it in Paint until I get it small enough.