Flowers have been used to signify peace for millennia. Lavender is said to be the ultimate peace flower, though many others are recognised as symbolising concord and harmony: apple blossoms, lotus flowers, lilies, and white poppies are said to help bring tranquillity and peace to our lives.
Below is a link to a public group on Facebook, Flowers for Peace; you can join and contribute your own photos as the seasons roll by.
The following photos are from an album saved on my computer.
Click on the photos for full screen
Dorje Lama, Kathmandu, Nepal