I've got a very easy watercolor background tutorial up at The Crafter's Workshop. Here's how my example turned out.
I'm always attracted to the soft look of watercolors and I thought that sort of background would go well with this photo of my little one. She looks like a doll here (yes, I'm inclined to be partial):), hence the title of my page.
Again, if you're interested in how I got this effect, please go check out my tutorial here. Thanks so much and have a great day!