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Along the lines of using filters for artisitc reasons, there are a number of things I can suggest that hopefully create a spark. Maybe Render Clouds on a different layer and play around with the blending modes. Maybe a more "fixed" pattern (something like a grid or small circles or scan lines) set on a layer above the blue, set to multiply, and reduce the opacity. Sometimes just a simple gradient may do enough to break it up.

Sometimes the best thing to do when you find that you're making slow progress on the creative front is to find things that inspire you. I flip through magazines, hit the local art gallery, grab a pencil and pad and start drawing random things, search the web and start bookmarking those things that you would like to recreate.. then recreate them. Having a strong idea of what you want it to look like when you're done will make this process of getting started much easier.  Is there a particular site that has something that you are looking to accomplish?