One of the folklore traditions on this day is the custom to weave circlets out of willow shoots, which replace the palms from the biblical tradition. The circlets are worn either on head or wrists and later hung on doors.
People whose names are in some way associated with flowers or trees celebrates Palm Sunday as their name day.
I like the shining smile of this gipsy boy, who was selling willow shoots and flowers near "Al. Nevski" Cathedral.