Atop and In

Atop and In are two functions by which you can  decorate with   texture to any structure on transparent background. The detail instruction  is given below. 
Take the following ellipse to imagemagick.

Ellipse

 Upload the green plasma tile at Composite. Choose either atop or in and click on the 'tile across and  down the image canvas'  button. Now press composite. 

Here is the final result. 

You can now composite the picture of your choice in the green elliptical frame.