Ghost-imaging has been demonstrated for a variety of photon science applications. A ghost-imaging experiment for hard x-rays was recently achieved using data obtained at the European Synchrotron. Here, speckled pulses of x-rays from individual electron synchrotron bunches were used to generate a ghost-image basis, enabling proof-of-concept for experimental x-ray ghost imaging. At the same time that this experiment was reported, a Fourier-space variant of x-ray ghost imaging was published. Ghost imaging has also been proposed for X-ray FEL applications. Classical ghost imaging with compressive sensing has also been demonstrated with ultra-relativistic electrons.