This is how to display a nice background on Android Wear notification instead of a plain color or a pixelated icon

AndroidWearBackground

        int notificationId = 001;     

     // Create a WearableExtender to add functionality for wearables
        NotificationCompat.WearableExtender wearableExtender =
                new NotificationCompat.WearableExtender()
                        .setBackground(bigBitmap);

     // Build the notification
        NotificationCompat.Builder notificationBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_launcher)
                        .setContentTitle(myTitle)
                        .setContentText(myText)
                        .setContentIntent(myContentIntent)
                        .extend(wearableExtender);


      // Get an instance of the NotificationManager service
        NotificationManagerCompat notificationManager =
                NotificationManagerCompat.from(this);

      // Issue the notification with notification manager.
        notificationManager.notify(notificationId, notificationBuilder.build());