Abstract background by PS

I searched on the Intrernet and found out a good tutorial about opacity mask. I think that you guys can do a lot of interesting things through this one such as background, decoration, etc.
The steps to do it:
- Draw a shape with tool of your choice. I drew it by Pen tool.
- Effect > Distort and Transform > Transform and type (but you can change these settings depending on your shape and how it looks)
+ Scale: Horizontal = 75%
Vertical = 75%
+ Move: Horizontal = 0.25 in
Vertical = o.5 in
+ Rotate: Angle = 45 degrees
+ Copies: 5
+ 9-point Proxy (the box with nine points above the Random checkbox): Check the middle right checkbox on the 9-Point Proxy
- Object > Expand appearance
- With the shape still selected, create a Radial Gradient from the Gradient Panel. Keep the swatches of the gradient the default Black and White and take off the stroke if there is one.
- Draw a rectangle with the Rectangle Tool (m) that encompasses the transformed shapes. Take off the stroke, fill it with a color and send the rectangle to the back
- Select the rectangle and transformed shapes and select Make Opacity Mask from the pop-up menu of the Transparency Panel
Now you have abstract art.
Hope you enjoy it ^-^!