One of the 3D cards that I still have from when I first started doing this craft.

It takes anywhere between 3-8 hours to make. The more detail in the 3D that I get, the longer that it takes. I use anywhere between 7-15 of the same card and cut out specific sections with an x-acto knife by hand. Once I am happy with the parts that I have cut out, I attach each layer using scrap booking squares. I avoid using glues or cements so the card does not warp. The squares work just as well as the glue.

Look for more in the future!

Close-up Image:
http://www.furaffinity.net/view/16249229/

Disclaimer: I do not claim ownership of the art on the cards. I just craft the 3D effect.