Could anyone please share a STRUCTURED_POINTS vtk file (i.e., vtkImageData)?

Could anyone please share a STRUCTURED_POINTS vtk file (i.e., vtkImageData) which contains contents of an image? Ideally the size of the image is small so that I can easily analyze it. Also, is it possible to convert an image file like png or jpg to a vtk file with structured points? Thank you.

You can generate a vtkImageData in ParaView using Source->Wavelet.
You can open a jpg or png directly in ParaView.