public static attribute PathAttribute
{
  public string Path {get;set;}
}

[Path("/blah/blah/blah")]
public class MyControl : UserControl  {}

public abstract class EasyUserControl<T> : UserControl
{
  public static T Create()
  {
     var UCPath = typeof(T).GetCustomAttributes(typeof(PathAttribute, false))[0].Path;
     return (T)(object)((Page)HttpContext.Current.Handler).LoadControl(UCPath);
  }
}