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Need assistance passing the index of map items in a list as a variable to marker icon parameter on VF page

I have having difficulty getting the index of a list item contained within the <apex:map> tag
I am trying to access the index of a list contained within the map tag on my VF page to pass to a resource call in order to assign custom map markers to each line item because we want more varied markers than the standard.  My VF snippet it thus:
<apex:pageBlockSection title="Service Area For {!companyName}">
  <apex:map width="1300px" height="600px" mapType="roadmap" center="{!mapCenter}">
    <apex:repeat value="{!locations}" var="apt">
    <apex:mapMarker title="{!apt.item.Subject}" position="{!apt.item.loc}" icon="{!URLFOR($Resource.GoogleMarkers, + '.png')}">
    	<apex:mapInfoWindow >
            <apex:outputPanel layout="block" style="font-weight: bold;">
              <apex:outputText >{!apt.item.Subject}</apex:outputText>
            <apex:outputPanel layout="block">
              <apex:outputText >{!apt.item.loc}</apex:outputText>
			<apex:outputPanel layout="block">
                  <apex:outputText >{!apt.item.ServiceTime}</apex:outputText>

And my apex snippet controlling it is here:
public PageReference specificDate(){
			dte = date.parse(dteInput);
		catch(Exception E){
			ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Date formatted incorrectly.  Check entry and try again.'));
		locations = new list<mapWrapper>();
		names = new Map<String, String>();
		integer i = 0;
		integer counter = 1;
		for(Event evnt: [SELECT Id,
           							FROM Event
           							WHERE OwnerID IN: users
           							AND RecordType.ID = '01213000001CDUu'
           							AND ActivityDate =: dte
           							ORDER BY StartDateTime ASC]){
               	names.put(evnt.Subject + ': ' + evnt.Service_Time__c,evnt.Location);
                mapEvent myMap = new mapEvent();
                myMap.Subject = evnt.subject;
                myMap.ServiceTime = evnt.Service_Time__c;
                myMap.loc = evnt.Location;
                myMap.icon = i;
                locations.add(new mapWrapper(myMap, counter));
                counter = counter + 1;
		//if(locations.size() > 0){		
	//		mapCenter = locations[0].loc;	 	
	//		}
	//	else{
			mapCenter = companyAddr;
		//	}	
		return null;	
	class mapWrapper {
  		public Integer counter {get;set;}
  		public mapEvent item { get; set;}
  		public mapWrapper(mapEvent item, Integer counter) {
    		this.item = item;
    		this.counter = counter;

All I really want to do is to pass the index to the icon parameter here:
<apex:mapMarker title="{!apt.item.Subject}" position="{!apt.item.loc}" icon="{!URLFOR($Resource.GoogleMarkers,!apt.counter+'.png')}">
I've tried just using apex:variable or apex:param but apparently they're prohibited from use anywhere within the map markup. 
This is how far I've gotten to try and bypass that.  However, when I try to save I get this error: "Incorrect parameter type for function 'not()'. Expected Boolean, received Number" so I'm a bit stuck on how I could go about getting past assigning the counter value so it doesn't think I'm trying to do a comparison function, because any other way to try to save it gives me a syntax error, so any suggestions would be appreciated, or if anyone knows of a simpler way to do it overall in order to individually style each map marker and can point me in the right direction that would be great.
Does the icon keyword require a key/value pair?

If not - you might try.... icon="{!URLFOR($Resource.GoogleMarkers)}{!apt.counter}.png" ...
Thanks for the suggestion, but I think it does need that key/value pair to assess the individual icons within the zip file that static resource points to because, while your version will save in that format without error, the icons are unfortunately not rendering on the map.