There's a new technique on the block, the double processed stamping technique. It was devised by Joey in Adventures in Stamping and I decided to make a tutorial so it's easier to understand.
Here's a little breakdown if reading it might be easier for you to understand.
First, take the image/pattern that you want to be on the top of everything and stamp that like you regularly would.
Then, take the next image and stamp that like normal, except that that first one is still on the stamp. This will cause the first image to only appear where the second image has the etching on the plate.
Repeat this as many times as you want ad then stamp on your nail.
Here's the video tutorial so you can actually see what it is :)