There are a variety of waste forms currently in use and many more being studied for potential use. Or center is developing new materials as potential waste forms. To achieve this goal we are preparing and testing numerous actinide containing materials. I will present some of our efforts focussing on the crystal growth of uranium and transuranium containing phases via two different crystal growth routes, mild hydrothermal and high temperature solution flux growth and their evaluation as potential waste forms. The mild hydrothermal route works extremely well for crystallizing complex fluoride phases, such as Na3GaU6F30, Na3AlNp6F30, and Na3FePu6F30, while the high temperature flux route works well for crystallizing oxide phases, such as Cs2PuSi6O15 and Na2PuO2(BO3). The synthesis and structures of these phase will be discussed, along with our approach of identifying potential compositions that we can pursue synthetically.