Step 1 : Make new document in Photoshop. Set size to your comps resolution (I used 1280x1024)
Step 2 : Choose paint bucket tool and pain it to black.
Step 3 : Go to planetrenders.net and find your render (You need to register) (You can also find your render from somewhere else, if you want)
Step 4 : Once you have found your render, go back to Photoshop and open it. Use Eraser tool and erase any background and/or "credits" (Rendered by etc.) from render.
Step 5 : Once you are done, Rectangular Marquee Tool (M) to circle the render.
Step 6: Then copy paste it into your wallpaper background, now you need to resize it.
Step 7 : Go to Edit > Transform > Scale, and size it so it looks good.
Step 8 : Now select Layer 1 in your Layers window. Right click on it and select Blending Options.
Step 9 : Click on Outer Glow (Not only checkbox) So you can see settings.
Set the color to what you want (I chose red), and then modify settings to something like this :
Step 10 : Now you should see something like this :
Congratulations! You are now done with your first wallpaper! If you want it to be more complicated, you can add text, different background, and more pictures! Hope you liked my first graphic tutorial. And remember, if you need any support, dont hesitate to contact me!