Change Project Health Icons and/or Colors

Hello, 

Is there any way to change the project health icons or their colors? We have had some negative feedback from executives regarding the yellow health icon (triangle w/ exclamation point) and its color as it looks more brown than yellow, even compared to the yellow on the task summary charts. It can also be difficult to see the green in the green health icon when viewing dashboard reports because there is relatively little color in the icon.