Here we are going to show you how to used 3d transform filters.
Step 1: Start out with an image thats 500 x 500 pixels. Create a new layer above the background. Then go to Filter->Render->3D Transform. Select the cube tool and Drag a bunch of long rectangles on the image like I have here. We're trying to go for a city tall building type feel so that is why I chose long cubes.
Step 2: Next, select the rotate tool. Rotate the image until you have something like I have here. You want to make sure that all of the sides are shaded and not transparent. Also, try to make it look like you are above looking down at the cubes.
Step 3: Then click OK to apply the effect. You may have to hit Ctrl+T to bring up the free transform tool and rotate your image until it looks as if it were a city that you were looking down at.
Step 4: Then hit Ctrl+U for the Hue and Saturation dialog box. Click colorize and choose a dark blue color (I used H:210 S:50 L:-45).
Step 5: Looks cool but we need to add a little more to make it more trendy. So go to your background later and apply a linear gradient. I used one of the defaults that comes with photoshop.
Step 6: Finally, I added a silhouette figure to the image and dropped the opacity a little.