Example on an Umbraco property editor with a content picker (both single and multi)

ContentPickerDemo.html

<div ng-controller="ContentPickerDemo.Controller">

    <div>
        <a href="#" prevent-default ng-click="addSingle()" class="btn btn-default">Add single</a>
        <a href="#" prevent-default ng-click="addMultiple()" class="btn btn-default">Add multiple</a>
    </div>
    
    <div ng-show="model.value.items.length > 0" style="margin-top: 10px;">
        <div ng-repeat="item in model.value.items">
            <i class="icon {{item.icon}}"></i> {{item.name}}
            <a href="#" prevent-default ng-click="remove($index)"><i class="icon icon-delete red"></i></a>
        </div>
    </div>

</div>

ContentPickerDemo.js

angular.module('umbraco').controller('ContentPickerDemo.Controller', function ($scope, dialogService) {

    if (!$scope.model.value) {
        $scope.model.value = {
            items: []
        };
    }

    $scope.addSingle = function () {
        dialogService.contentPicker({
            callback: function (item) {
                $scope.model.value.items.push({
                    id: item.id,
                    icon: item.icon,
                    name: item.name
                });
            }
        });
    };

    $scope.addMultiple = function () {
        dialogService.contentPicker({
            multiPicker: true,
            callback: function (items) {
                angular.forEach(items, function (item) {
                    $scope.model.value.items.push({
                        id: item.id,
                        icon: item.icon,
                        name: item.name
                    });
                });
            }
        });
    };

    $scope.remove = function(index) {
        $scope.model.value.items.splice(index, 1);
    };

});

package.manifest

{
	"propertyEditors": [
		{
			"alias": "ContentPickerDemo",
			"name": "ContentPickerDemo",
			"editor": {
				"view": "~/App_Plugins/ContentPickerDemo/Views/ContentPickerDemo.html",
				"hideLabel": false,
				"valueType": "JSON"	
			}
		}
	],
	"javascript": [
		"~/App_Plugins/ContentPickerDemo/Controllers/ContentPickerDemo.js"
	]
}