It's possible to change the default icon. Best to use is a .png file. A .ico bestand isn't rendered with IE7!

{mosmap icon='<Url icon>'|iconwidth='60'|iconheight='52'|iconanchorx='58'|
iconanchory='52'|iconinfoanchorx='34'|iconinfoanchory='1'|iconshadow='<Url shadow'|
iconshadowwidth='60'|iconshadowheight='52'|iconshadowanchorx='34'|
iconshadowanchory='0'|icontransparent='<Url Trans>'|iconimagemap='<image map>'|tooltip='Tooltip'
|text='Custom Icon'}

JavaScript must be enabled in order for you to use Google Maps.
However, it seems JavaScript is either disabled or not supported by your browser.
To view Google Maps, enable JavaScript by changing your browser options, and then try again.

Even an animated icon (.gif) works:

JavaScript must be enabled in order for you to use Google Maps.
However, it seems JavaScript is either disabled or not supported by your browser.
To view Google Maps, enable JavaScript by changing your browser options, and then try again.