I use a range of annuals to enliven pots and to further encourage insects. I don't really use them in the beds unless we are talking about perennials that fail each year and I've repeated such as Violas, Delphiniums, Lupins and Penstemons.

Normally the annuals, or the plants I treat as annuals, include Bidens (yellow), Bacopa (purple and white), trailing Lobelia (blue and white), Violas, unusual Impatiens/Begonias (small, discreet, exotic ones not big blousy ones), the occasional Digitalis and the highly scented alyssum (Lobularia maritima) in white and purple.