Salesforce: Dynamically Assign the Salesforce standard icons in the Visualforce page

//VF Page code

    <apex:pageBlockTable value="{!recordList}" var="record">

        <apex:column headerValue="Icon">

           <apex:image id="theImage" value="{!record.colorCode}"/>

        </apex:column>

    </apex:pageBlockTable>

//Apex Class to get the values
   

public List<accountRecord> recordList {get; set;}

public void getAccount() {

   recordList = new List<accountRecord>();

   for(Account record:[SELECT CreatedDate FROM Account]) {       

       String colorCode = (record.CreatedDate>System.Now().addDays(-3))?'/img/samples/flag_green.gif':(record.CreatedDate>System.Now().addDays(-5))?'/img/samples/flag_yellow.gif':'/img/samples/flag_red.gif';

       recordList.add(new accountRecord(colorCode));

   }

}

public class accountRecord {

   public String colorCode { get; set; }

   public kbArticleRecordWrapper(String colorCode) {

       this.colorCode = colorCode;

   }

}