Umbraco V5 Example - Media Picker List Images from Folder

ListItemsFromMediaFolder.cshtml

@inherits PartialViewMacroPage
@using Umbraco.Cms.Web
@using Umbraco.Cms.Web.Macros
@using Umbraco.Framework


@{
    //Output an image from the media picker

    //Property alias of mediaPicker
    var mediaPickerPropAlias = String.IsNullOrEmpty(Model.MacroParameters.mediaPickerPropAlias) ? "myMediaPickerPropertyAlias" : Model.MacroParameters.mediaPickerPropAlias;

    //Check that the property has a hiveID stored
    if (!String.IsNullOrEmpty(DynamicModel[mediaPickerPropAlias]))
    {
        //Get the mediaFolder
        var mediaFolder = Umbraco.GetDynamicContentById(DynamicModel[mediaPickerPropAlias]);

        foreach (var mediaItem in mediaFolder.Children)
        {
            //Get the image URL
            //The HiveID of the selected media item from the media picker
            //Then the string property alias of the upload data type on the media type
            var imageURL = Umbraco.GetMediaUrl(mediaItem.Id, "uploadedFile");

            //Get the name of the media item
            var mediaName = mediaItem.Name;
            
            <img src="@imageURL" alt="@mediaName" />
        }
        
    }
    else
    {
        <p>No media HiveID present</p>
    }
}

Got it!