You used it "properly" and it can be used many ways... you can re-size it and change the shades and transparency and layer it , turning each layer on maybe a slightly differnt angle .. to create a another effect..
you can use it to make backgrounds grungy looking ( like a stain)
Or fill the shape with a texture/pattern
with Art the rules are in the hands of the designer... you have put YOUR touch there and its gorgeous!!
<whisper> Now turn off the computer and get back to packing - you're moving house this weekend arent you?