I discovered how make a cool 3d image with letters or small doodles at different depths. This requires red/cyan (red/blue if your not technical) glasses.
Step 2: Draw Basic Picture
Open Gimp and click File/New then set the size. The default should be 420x300. I change it to 1000x714, which is about the same ratio.
Then your canvas opens. Inside of that, go to Layer/New Layer. Name that layer as the first letter that you want. After that you can use the paintbrush tool with black to draw the letter. Then add another layer and name it for your next letter. Then draw the letter. Repeat until you write all you want.
save as **** 1.jpg where **** is the name of the photo. click export, then ok.
Step 4: Add Depth
There should be a dialog titled layers. Select the first letter layer and use the move tool to click on that letter and move it left and right. Move it left for towards you, right for away. DO NOT move up or down, or that will mess up the effect. DO NOT move more than 25 pixels. Do this for each letter. I do random positions for each one. Save as **** 2.jpg.
Step 5: Make 3D
Now open Callipygian 3D. You might have to find it in C:\Program Files\Callipygian 3D\Callipygian2.9 or similar. Open the left and right pictures. **** 1.jpg is left, **** 2.jpg is right. Select the area where there is text by simply dragging over it. Then click Preview 3D/Anaglyph. Now you can put on your glasses and enjoy. You can save from there. I would save it as ****.jpg.
Step 6: Finished
I hope this Instructable was informative! Let me know if you have trouble regarding this. Good Luck!