Add an option under Edit > Preferences > Register > Graphics to use different register background colors for each of the top account types, i.e. for assets, liabilities, income, expense and possibly equity. Colors might be selected from the Pantone color chart or other non-proprietary chart. Colors should be selected to be visibly different even to persons who are color blind. This is intended to be a program option, not to be confused with the existing Use System Theme Colors option or the very obscure Style Sheet feature.