I love this idea: succulents in a vintage birdbath – spotted outside a shop in Montecito.
That’s an agave attenuata in the middle, which will get quite big. The rest of the birdbath is filled with dudleya, jade, echeveria, kalanchoe, and sedum. The green plants in the middle are ringed by purple and blue succulents, with a few small green sedums tucked in around the very edges. Your dudleyas (the silver/blue/purple ones) will need to grow a bit before the rosettes get long and full like these. When they get too leggy, just pull them out, break off the long stems, and replant the rosettes.