Thanks for writing! If you love lilies, you can try Oriental lilies (such as 'Star Gazer') which have bigger, bolder, strongly fragrant flowers. Many of these varieties bloom in late summer.
You could also try reblooming daylilies --- some types will bloom on and off from June to frost to provide lots of garden color. Otherwise purple coneflower and black-eyed Susan are two great long-blooming perennials to stretch the color into summer and early fall. Gaillardia and perennial hibiscus are two other long-blooming perennials you can count on for easy-growing color all summer.
Learn more about these and other great varieties in our Plant Encyclopedia: http://www.bhg.com/gardening/plant-dictionary/
I hope this helps!
---Justin, Senior Garden Editor, BHG.com