The 7 colors signify the different shades of life. The rainbows have 7 colors namely Violet, Indigo, Blue, Green, Yellow, Orange, and Red. Rainbows are seen right before or after rainfall.
One thing that is rare and always attracts us is the Rainbow. The blooming flowers bring a smile on our face whereas the lava from the volcano tells us about the unavoidable destruction. Nature has its way of giving us hope, peace, and happiness. Rainbow tattoo designs are probably one of the most positive design out there.