colours of the Rainbow postcards

Seven colours to the rainbow, seven cards in an envelope decorated with a rainbow (just a few pen strokes of different colours will do), to your one partner representing each colour. One colour of a rainbow must appear somewhere in one postcard. 7 colours hence seven postcards Sender's choice, any subject as long as it fits into a rainbow, but is not a real rainbow. (However if you have a rainbow postcard, give me, give me, I envy you.)

All store bought , unwritten and in good condition. Take a look at what you have in your stash.

Looking at a few of the cards I have on hand: eg. Red lighthouse, orange sunset, yellow bus, green forest, blue skies, indigo coloured shirt and a violet violet.