Once you learn a few methods, play with them. If you have Photoshop or a similar graphics app, learn as much as you can about blend layers and their modes. You might also want to check out "Dreamy Photo" (at least that's what I think it's called,) a free plug-in from AutoFX. I believe you can get it at their site. Again, don't accpet the default effects...play around with the settings in the GUI to get the look you want. Better yet, create a "blurry" or "dreamy" layer, then drop it onto your original image so that you can control opacity. (If this were a cookbook, I'd say "season to taste.") I almost always add some glowing blur to my images, but IMO it can really get out of hand.