I know you may think the image below seems simple, but think what you can do using the same technique applied here on a larger project! For example, create a huge poster, and use various images instead of the color fill I used. Pretty interesting, don’t you think? Anyway, you’re going to use the same approach as here, so here it goes…

Creating a Simple Puzzle

1. Create a new image, using any settings you want. For me, it’s same as always(check the image below).

Creating a Simple Puzzle

2. Go to View>New Guide and add 4 horizontal and vertical ones, with 100 pixels between them. Obviously, as your image size changes, the number of required guides should change too.

Creating a Simple Puzzle

3. Press Ctrl+Shift+N to add a new layer. I called it Yellow Part, because this layer is going to host the Yellow piece of the puzzle.

Creating a Simple Puzzle

4. Select the Rectangular Marquee Tool and create the selection for the Yellow area. While selecting, hold Shift to add, and Alt to subtract from the selection.

Creating a Simple Puzzle

5. Use the Paint Bucket to fill the selected area, and then press Ctrl+D to deselect.

Creating a Simple Puzzle

6. Now, select the White area on the Yellow Part layer(you can use the Magic Wand Tool, for example), expand the selection by 5 pixels(or more/less, depending on the size of your document), and press Delete.

Creating a Simple Puzzle

7. Next step is to create a new layer. I called it Blue Part, and the reason is obvious…

Creating a Simple Puzzle

8. Create the selection for the Blue area, and use the Paint Bucket Tool to fill it up with color!

Creating a Simple Puzzle

9. Repeat step 6, for this layer. The result should look like the image below…

Creating a Simple Puzzle

10. Now, switch to the Yellow Part layer, apply Drop Shadow and Stroke using the settings below, and it’s all done!

Creating a Simple Puzzle          Creating a Simple Puzzle

As I was saying at in the beginning, this can be a standalone project(for example, you can use it as a forum avatar), or you can use this technique for larger projects. Good luck!