The Spongebob rainbow is a very popular meme that depict Spongebob holding his hands apart with a rainbow full of glitter and sparkles, stretching from left hand to his right hand. This meme is most often used in a sarcastic tone captioned with, "Nobody Cares." His mannerisms and wide eyes almost have a delusional or annoyed look.
Almost anything could be captioned on the Spongebob rainbow and it would be a hit. He is one of the most recognizable cartoons today and his large personality takes over the internet memes. Another popular caption for Spongebob's rainbow is, "Imagination." Similar to the 'Nobody Cares" meme, this is filled with sarcasm and funny undertones. Imagination, because most don't have any and giving them such a simple response on a rainbow is only right.