Those are amazing! Personally, I like a lot of color and would probably do the contrast that Shiela did. Just me though. If you are going for a soft look, then that's different. As for the background, I usually sample a color from the image. Here I would sample a dark purple from it or a light purple (lavender). Try both and see which compliments the images best. I would love to have those hanging on my wall! I really like purple.....my whole bedroom is purple; walls, carpet, curtains, bedspread. heh heh. Got off topic.....anyway, I would love to see the different variations you come up with if you play with it more. :)

~Damia~ LeviathanPhotography