Crediting me helps other artists find this. And it accumulates good karma.
Marbling for the better templates I uploaded recently. Approx. 1600px diameter.
Templates: [link] [link] [link] [link] [link]
I would suggest experimenting with its color, rotation, and opacity to get the look you want.
Edit August 23rd: Made the whole thing red for easier color change.
My Photoshop secrets: To adjust the color, go to the top menu> image> adjustments> Hue/saturation. Play around with the sliders until you get what you want. To let more of the rest of you stained glass image show through it, on the right side, click on the arrow next to where it says 'normal'. Usually 'multiply' gets the right effect, but try the other options for a different look. Don't forget about the opacity! That slider is next to the drop-down 'normal' box.
I'll make a tutorial if my description is confusing.