Blue Prints

1st before we start we need to create our grid pattern, create a new document with a transparent background with the size 45 x 45, select the pencil tool and a 1 pixel size brush and the color black. Now make a 2 pixel line then miss 1 pixel out then make another 2 pixel line and so on.

Once you have something like above goto "edit > define pattern" and give it a name of your choice.

Right that's that out the way. Open up your image you want to turn into a blue print, I'm going to use a picture of a car for this example but houses and other objects work fine also.

Once you have your image loaded up goto "image > adjustments > desaturate" your image should then go grey, then goto "filter distort > find edges", you should have something like this.

Now there's a bit too much of detail for my likeing so press "ctrl + L" to adjust the levels. Move the "black", "grey" & "white" markers/sliders to your liking have a good play about with them, once your happy press okay, here's mine.

Now goto "image > adjustments > invert" this will replace the colors to the opposite, (white will be black, black will be white.)

Create a new layer above your image and fill it with the color (#0054a5) then set the layer mode to "linear dodge" your image should now look like this.

Create a new layer and select the paint bucket tool, at the top of the menu switch from foreground to pattern.

From the patterns menu select your pattern.

Fill the layer with your pattern, set opacity of the layer to about 30% and the blend mode to overlay.

Now using the arrows from the custom shapes menu and the type tool add some blueprint elements to the canvas.

You can be creative as much as you like, to adjust the perspective of your arrows and text goto "edit > transform > distort" use the lines on your image as a guide to how they look. That's pretty much it, the more lines and numbers you add the more better it will look, you could even add a few other items.