Your work should look somewhat like this and your Layers should be arranged as such.
1.) For SHAPE Layers 1-5 Change the Layer Mode to "Grain Merge" (keep layer 6 and 7 at Normal)
2.) Create a New Layer and name it "Clouds". Fill the layer with White.
3.) Go to Filter-->Render-->Clouds-->Difference Clouds. Set the Detail to 4 and click APPLY to apply the filter to your new layer.
4.) Change the "Cloud" Layer Mode to OVERLAY
5.) Create another New Layer on top of the rest and name it "Spectrum Gradient. Keep the Layer Fill Type set to "Transparency"
6.) Select the Gradient Tool
Under Tool Options...
-Gradietn-->FULL SATURATION SPECTRUM
7.) Click and Drag from the Lower Left corner to the Upper Right Corner to Apply the Gradient.
8.) Change the Layer Mode to Overlay
9.) Create another New Layer and name it Shadows and Lighting...this time fill your layer with Black.
10.) Go to Filter-->Lights and Shadows-->Lighting Effects
First, set the distance to .598 and make sure INTERACTIVE is selected
11.) Change the Layer Mode to Overlay
12.) Crop the Image however you would like Tools-->Transform Tools-->Crop
13.) Go to View-->Show Guides to hide the guides you have made.
14.) Save and Print!