Blends
Blending in Photoshop is quite easy. All you have to know is how to use te tools. Read this tutorials closely to learn how to blend images. There are tons of ways to blend, here's only one of them.
Step 1: First you have to find
at least two images you want to blend together. Open both of them in Photoshop. I have chosen to use these images:
Step 2: Open a new dokument which is bigger then both of your images. It can be the same hight but it has to be longer. Now use the
Move tool, which looks like this:

. Drag both of your images on to the big background. Here's how it should look now:
Step 3: Select your
lasso tool, which looks like this:

. Change your upper settings so they match mine:
Step 4: Now mark the aera that is overlapping the image underneath. Like I've done:
Step 5: Press the
delete button on your keyboard 3 or 4 times, as many as it takes for the two images to blend! Here's my finished result: