I have several layers that are point geometries. I am defining them custom markers symbols and such symbols have colors (red, yellow and green) to represent values.
Since there are several of them in an area, I started with marker clusters, but quickly realized that clusters are good only if all markers mean the same (like redfin home markers).
I would like to stick to markers but to avoid visual clutter - I would like to resize them based on the zoom level. If I design these markers in SVG, I could achieve this - as its easy to size SVG than raster formats, similar to this link http://mapbox.com/tilemill/docs/guides/advanced-map-design/#images_as_icons
Please send me any examples or sample sites you have developed or come across so that I can see the visual appeal of having several custom markers in maps.