Ideas to add summer colour please

Hi
I have a bed that looks lovely in Spring with the following plants in it.
Three pink bleeding hearts
Two dwarf Lilacs
One Rose
Two Fushias (the only summer flower)
Two Lupins(these will be removed as they don't like it)
A couple of small spreading plants at the front. It gets full sun most of the day. The photo was taken this morning, so I was facing the sun(East).
I would like to add some plants that have flowers that will last the summer.
All ideas welcome