Here in Israel, the tradition is for young children to wear flower crowns to celebrate Shavuot. (Along with the obligatory white shirts.) See my twins:
Why is this? Is it related to Shabbat 88A ??
Rav Simoi expounded: "When Klal Yisrael said 'Na'aseh' before saying 'Nishma,' 600,000 Malachei HaShareis came to each and every member of Klal Yisrael and crowned him with two crowns - one corresponding to 'Na'aseh' and one corresponding to 'Nishma.'" (Shabbos 88a)
But on the other hand, what about the general prohibition (minhag?) against wearing crowns since the destruction of the Temple. Eg Brides and bridegrooms no longer wear crowns...