This is the second exercise from Susan Tuttle's "Digital Expressions" book. I have done this kind of thing before using other tutorials. The effect can be very stunning. I think blurring the background portion of the photo creates a dream-like quality that is very cool. With this photo the blur also helps create a sense of movement.
On this one I colorized the background using a trick I learned a while ago. Select the layer you want to colorize. Go to Hue/Adjustment. Select "Colorize." Type 35 in the Hue box. The Saturation will change to 25, that's good for the effect. I used a Gaussian Blur set at around 3, just to soften the glass.
What I discovered: You could use the effect like that or you could use it to pop any color in any part of a photo, like eyes or flowers. The steps don't take very long, unless you are fussy with the selection. But the selection doesn't have to be that precise if you just want to pop a color against the same background. Here's what I mean in this example.