EDIT 10/1/18 -- I went back out and planted 30 Crocus vernus in mixed colors of yellow, purple, white, and purple-and-white-striped. Some I scattered a few at a time among trees near the house, and slightly less than half went under the Home Base mulberry tree. It started trying to rain partway through, but that's okay; we could use some rain.
EDIT 10/1/18 -- I planted 10 Allium 'Ping Pong' in the purple and white garden. These have round heads of tiny white flowers.