Step 1: To start off, create a new document 500x500px with a white background.
Step 2: Select a soft rounded brush with a diameter of 45px. Set both the opacity and the flow to 35%.
Step 3: Next, set the foreground colour to #660000.
Step 4: Using the brush tool scribble on your white canvas until it looks like something in the picture below.
Step 5: Set the foreground colour to #990000 and scribble some more onto your canvas.
Step 6: Set your foreground colour to #CC0000 and keep on scribbling on the canvas. You should now have something that looks like this.
Step 7: Now select 'Filter' then 'Artistic' and then 'Plastic wrap'.
Step 8: Set the 'Highlight Strength' to 5, and 'Detail' to 15 and 'Smoothness' to 5.
Step 9: After you have applied them settings, click on 'Image' then 'Adjustments' then 'Brightness/Contrast' and set the 'Brightness' to -25 and the 'Contrast' to +40.
Step 10: If you have followed all the steps in this tutorial correctly you should have something that looks like this.
Another variation can be found below.
Step 11: I hope that you enjoyed learning how to make guts in Photoshop and will try different methods to create different variations.
