Usually used as slang in Brazil, a colorful friend is a person who you can have an open sexual relationship with without a commitment. Brazillian name for "friends with benefits".
a brightly colored and unexpected artwork similar to what children in grade school experience when they color a piece of paper, then color over it with solid black crayon. When the black crayon is scraped off, there is a colorful surprise.
I like my women to have tats on their cleavage. That way, you get a colorful surprise when you squeegee-off the Cleveland Steamer.