Lily of the Valley is a favourite flower (still awaiting for them to bloom...!) and is often used for the May 1 holiday (in France, especially), but apparently the Russians like it, too.
the second card has a scene that could be from today which, I have just read in the news, is exactly what happened. for the first time since the breakup of the Soviet Union in 1992, a parade was held in Red Square. Putin is trying to revive nostalgia for the former CCCP, though to many in Moscow, it was "just another spring day and a chance to celebrate" (according to a couple of people interviewed in the news source I read).