Minimize new variable colors in identicon background colors

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The following discussion from gitlab-ce!20886 should be addressed:

• @ClemMakesApps started a discussion: (+1 comment)

  @tauriedavis we moved these colors from the code (so we were already using these colors), it would be ideal if we could reuse existing colors for these. I'm going to continue and merge this MR since these colors aren't new to our codebase but wanted to bring visibility into it as something we could improve and reduce our colors