One cool thing about my living room curtains (which I didn't know) is that they change colour between brown in the day and green in the night. I think this is probably due to the sunlight.
I don't know the exact name of the colour. The shopkeeper calls it "Ngap-See-Cheng" which if given a direct-translation would mean "duck-shit-green". *HeHe* Here is how it looks like at night.