Full sun gardening is not as hard as it may first seem. There are lots of flowers that will do well in full sun.
Some require maintainance, but they're lots of fun and color if you have time.
I've included some pictures of flowers with their names alongside them below.

Click on any of the pictures for a more detailed description of that flower and its care.
Happy Gardening!

Ageratum Allysum Celosia Coleus

Dianthis Dusty Miller Lobelia Marigold

Petunia Portulaca Salvia Snapdragon