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Preview of Final Result

Graffiti Wallpaper Photoshop Tutorial
Step 1 - Create a New Document
Choose File > New or press Ctrl/Command + N to create a new document. Set the size of the document. I'm using 1440 px (width) X 900 px (height) but feel free to use any size you want.
Step 2 - Background
Grab the Gradient Tool (G), pick blue color (#334C5C) and fill the background with it.
Step 3 - Placing Spot Light
In this step you're going to add a spot light to the background. It creates a focus on the main object. Create a new layer and name it "Highlight". Select the Brush Tool (B) from the tools. Select some soft round brush and set Master Diameter on 1900 px.
Step 4 - Changing the Blending Mode
Change the Blending Mode of this layer on Overlay. It blends the spot light with the background properly.
Step 5 - Placing a Shape
Create a new layer. Select the Rectangle Tool (U) from tools. Pick yellow color (#CBAA11) and create a shape similar as on the picture below.
Step 6 - Adding Shape #1
In this step you're going to add rounded rectangle shape on the right side of the shape you've created in previous step. Select the Pen Tool (P) and create a shape similar as on the picture below.
Step 7 - Adding Shape # 2
Duplicate the shape from previous step. Grab the Direct Selection Tool (A) and increase the width by dragging the corner points.
Step 8 - Duplicating Shape #2
Duplicate the shape #2 and place it in the top left corner.
Step 9 - Placing Custom Shape # 1
Select the Custom Shape Tool (U) and open the preset shapes. Click on the small button on the right and select option Arrows. See image bellow.


Step 10 -Placing Custom Shape # 2
Place the arrow named Arrow 18.

Step 11 - Creating Lines
It would be great if the shape looks like a road. To make that select the Rectangle Tool (U) and create shapes like on the picture below.
Step 12 - Creating a Circle Shape
Select the Custom Shape Tool (U). Open the preset shapes and load the collection of shapes named Shapes.

Step 13 - Adding Rectangle Shape
Once you've created the circle shape it's time to add the rectangle shape to the left and right side.
Step 14 - Duplicating the Circle Shape
Select the circle and rectangle shape. Press Alt and drag the shapes to right side of the screen (it duplicates the object). Then select the circle, press Ctrl + T and scale it down.
Step 15 - Creating Shape 3
Select the Line Tool (U) from tools. Pick purple color (#5b0cab) and set the Weight on 60 px.

Step 16 - Another Shape
To create next shape you will need these shapes.