Yes, Jean Watson has her own web page. You can google it. Or, you can try going to (I'm copying this off of a down-load I made)
On her page she uses images of women in nuturing roles. One of them I'm looking at seems to be a woman with three children, one in arms, with a lot of fruit in the background. The other image on her web page looks like a Greek or Roman fresco with a woman who has a basket of baked goods and she's handing a pastry or bisquit to something that might be a cherub. Elsewhere she has a picture of planet earth being surrounded by a pair of hands.
What you might pick up here is that Jean Watson is very religious but not Christian. (She may or may not be a Christian, that's not clear one way or another.) But her theory is very pagan in the sense that her theory is that we are All part of the One. None of us are truely separate from any other thing in the universe. We are all connected by our energy fields.
So any images of a goddess figure would probably work for your collage.
If you want to read a hot debate about Nsg Theory go to the Graduate Student MSN/FNP/PhD Discussion group and pull up a thread called "I *do* recognize the importance of nursing theory" You'll find that Watson is a very controversial figure.
My advice, however, if you want to pass your class in Nursing Theory is to not fight it. Just do your assignments and pretend you find theory fascinating.