[quote="Mr Wolf":2v4h4l9u]I was wondering if there's a way to have a large colored sprite (or tiled background) or something behind the particles that will only be shown in the spots where the particles are. I'm not sure how to do this or if it would look right, but I really don't want a lack of color to ruin my special effect. Does anyone know how to make this whole thing work?[/quote:2v4h4l9u]
My example is probably not exactly what you are looking for, but basically it is possible. Maybe the cap gives you a starting point for it. It was created to demonstrate something else, I'm not sure if I cleared it completely from the rest.
Here is a picture of what it does:
And here is the link (cap saved under 0.99.62):