I recently learned how to rotate a BitmapImage using the \'TransformedBitmap\' and \'RotateTransformed\' classes. Now I am able to perform clockwise rotations on my images. But
A quick trick for horizontal (only) flipping btw is to set FlowDirection property to FlowDirection.RightToLeft. If the component is a container though, some children of it may interpret the property differently (custom logic)