Filter by Icon on Map

I would be great if we could filter by icon on the map. For example, if I need to find restrooms, gas stations (I use red for regular gas and yellow for ethanol stations), I use the checkmark icon for 4x4 trails, etc. I think it would go a long way for people to be able to visually filter by icon and color, as these icons are always visible on the map. The icons already on base layer maps only show up when you zoom a certain amount, such as hot springs, gates, peaks, campgrounds, etc.