Tilt shift photography is indisputably cool. Buying a professional quality lens specifically for this technique is prohibitively expensive for most of us, so why not use an online tool to accomplish a similar feel? The technique was designed to make life-sized objects look miniature, but it can also be used to alter the mood of a picture. You can simply plug your picture into Tiltshift.com , or you can use photoshop to do a more customizable job. SmashingMagazine has written up great directions here.
Read up on the techniques in SmashingMag, then go have fun! The color boost feature is perfect for summer photos.