Check out Mathilda's lovely song to support the NHS which she made up in her awesome reading den.
Morris made a lovely fact sheet about rainbows and he has also produced a map on Google maps that you can all add your own rainbow to if you would like to!
If you open the link, there is a bar at the top to search in. Search for your address, select it and it should place a point on the map. Click 'add to map'. Then click on the paint bucket symbol at the bottom and there is a little rainbow symbol there.