French braids that meet in the back with a barrette, clip or other pretty hair toy is always a good look.

Recently I did my neighbor's hair before her prom.  I did a french braid on each side, joined them at the back of the head and continued to braid to the end.  I then threaded a large darning needle with a satin ribbon and "sewed" the ribbon through the braids and ended with the ribbons tied at the end of the single braid.  Adding a few small flowers to the hair will dress it up even more.

Another option would be to twist the hair in narrow rows.  Each row can be secured with a cute little claw clip or other clasp or elastic.

Hope these ideas help.