I haven't found red yet. Maybe Kool-Aid would work but so far nothing natural has. Raspberries made a really pretty pink and black cherry juice made a really nice brown. Beet juice made a soft brown. Mind you, I left the fabric in the juice while I was at work so it sat there for about 11 1/2 hours. Still, I don't think it would have been red even if I had gotten to it earlier.
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You can barely make out the outlines of the witch feet in the right hand piece and I was surprised to see a couple of faces in the fabric on the left when I looked at the photo. The ghosts were playing in the beet juice apparently.