The Red Challenge from Gethin Thomas seems like a good idea and something I can participate in because I am allowed to post old images. I am not sure if I am allowed to post more than one image, but since this is not a competition (based on my interpretation), I hope it is okay.
Here are six predominantly red (or reddish) images that I found in my library. Except for the last one, they were all taken with my Moto G phones.
These are old images that I have posted before, so this is just a "fried rice" post. (Chinese used to make fried rice with overnight leftovers, so it's a form of recycling.) 😊