Faux painting for stone look

I'm refinishing my basement on a budget (who isn't on a buget these days) I think I would like to paint one wall to look like stone. I'm not sure what look I'm going for ... field stone, more "block'y" or a just a plastered look. My son painted a tree - bare as in a winter scape - on one wall and I would like to keep that there. I have no idea how to incorporate it into the scheme of things. It only takes up part of the wall, I will need to do something to the rest of the wall. At one time I was hoping to make it look like a roof top but decided I didn't really have enough skill. We are putting down a laminate floor with a stone finish so I am not sure if a stone wall is too much stone or not. Any ideas?