To dream of rainbows is all good , seeing one upside down though makes one curious , it's probably nothing but could be "something".
Were you floating around in the sky wondering if this is a dream or not ?
Strange , how rainbows are seen as wonderful pleasant sweet dreams denoting happiness - A sky like that is foreboding and a warning comes with it , you might encounter a distressful situation soon , possibly in a worst form,Death,family troubles,and National upheavals will occur
To see a rainbow in your dream represents hope, success and good fortune in the form of money, prestige, or fame. The rainbow is also seen as a bridge between your earthly, grounded self and the higher, spiritual self. It refers to joy and happiness in your relationship. Alternatively, the rainbow implies that your troubles are almost over. Good will come out of your issues. Just hang in there.
To dream that something is rainbow colored implies that you need to see things in a more positive light. You need to be more optimistic. Also consider the significance of the object.