Plenty of options. First off pansies are more of a cool season annual, thinking you meant petunias for summer. Might as well do some tulips possibly after taking out mums in the fall. The key to annual plantings is bed prep at every stage. Then consider if there is a sprinkler or if they will have to survive on rain alone. Depending on the site, maybe planters at entrances to office buildings. Tough annuals like begonias, ageratum, salvia, vinca and marigolds are a good place to start. Marigolds need a lot of dead heading or the look like ****. Annual grasses and millet are good accents also.