Since Power BI Desktop’s March 2017 Update, it is possible to apply a color theme to your entire report. When you apply a so called “Report Theme”, all visuals in your report use the colors from your selected theme. Unfortunately, you can’t just import your Office Theme Colors into Power BI Desktop since they have different structures and filetypes. Therefore, I developed an Excel tool (the download link is at the end of the article) that converts your Office Theme into a Power BI Desktop Theme in 4 simple steps.
Excel tool to convert an Office Theme into an Power BI Desktop Theme