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Amino acids as the building block for the silk protein are generally colorless. Is there any way that a spider could be genetically modified, or somehow the prey be injected with something that would result in the spider producing a web with different colored silk? I would then love to learn if this has any implications on the web structure (both integrity and its ability to attract prey) when compared to a normal web.

brilliant! id love to see that as well

I would look at other environmental conditions, like in nature. Change elements like humidity, heat, wind and see if there are changes in web design.