What factors to consider when picking a color theme for a short user survey?

I fairly frequently create short, google-doc surveys with 3-5 questions. Before today I always used the default template and never thought to change colors.

However, considering I also work at a concert venue running stage lighting I am very aware of how color affects mood in that context, leading me to wonder about the UX/color aspects for a survey.

Specifically I am choosing between the default themes on Google Forms.

• What should I consider when choosing a color theme for a short survey?