Recently I started posting images like this, and you might be wondering how you can do it:


Besides a digital camera, you will need a tripod and photo editing software. I use Adobe Photoshop, but you can also use a free online photo editor, such as
Pixlr.
Take your images with the tripod as stable as you can make it (tighten all the knobs and try not to move it when pressing the shutter). Remember, the only thing that changes between images should be you. My camera has a flip around screen that helps me judge where I am in the frame. You can also use reference points to make sure you don't step outside the photo frame (I used my radiator and lamp in the top photo, for example).
There are two different editing approaches, depending on your skill level:
Easy method: As long as your body doesn't overlap in any of the photos, make a box around yourself in the second image with the marquee/dashed box tool, copy, then paste it into the first image. Move this pasted portion around until the background lines up seamlessly. I like to zoom in on one area when lining up the images and make fine movements with the arrows on my keyboard. I used this method for the brick wall image above. It was quick, but you can see the seams on the cement at the bottom.
More accurate method: If your body overlaps (or you have shadows, etc.), you can use
this tutorial. It will be time consuming if you aren't familiar with the features of Photoshop. If you are confused, google it; there are a lot of Photoshop instructions and tutorials on the web. This is the method that I used in the top photo.
Good luck!