Annual Flower Garden Ideas

This is my second year having a garden, and I'm excited to the seedlings for this season's flower garden. I'm in zone 8A and have a space to start seedlings indoors with lights and seedling matts.

Last year I planted lots of yellow /orange marigolds and calendulas and cosmos. This year I want a different color theme. I've love to hear some suggestions? I'm thinking blue/purple and white, with maybe some orange in there? But I'm having trouble finding good blue/purple flower options. Any suggestions for annual flower gardens appreciated!