Has your source of feeders been changed recently? Or are the feeders themselves being fed a different diet now? (Ask the source.) If so, it's possible that they have been fed something that's showing up in your snake's output. Or it's possible that in this cold weather, they chewed something they weren't supposed to- like colored cardboard that got within reach.
Now & then I've seen snake urates with a faint tinge of greenish-grey tones. As far as I know, it usually means nothing but could possibly signal some sort of infection- no way we can tell you for sure. You could always have your vet take a look at it, but I'd ask first if they can test it. (The color I least want to see in snake output is red or black.)
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