Prom Theme Decorations

decorations
(decorate) make more attractive by adding ornament, colour, etc.; "Decorate the room for the party"; "beautify yourself for the special day"
(decorate) award a mark of honor, such as a medal, to; "He was decorated for his services in the military"
Ornamentation
The process or art of decorating or adorning something
A thing that serves as an ornament
(decorate) deck: be beautiful to look at; "Flowers adorned the tables everywhere"

theme
An idea that recurs in or pervades a work of art or literature
The subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic
The first major constituent of a clause, indicating the subject-matter, typically being the subject but optionally other constituents, as in “poor he is not.”
subject: the subject matter of a conversation or discussion; "he didn't want to discuss that subject"; "it was a very sensitive topic"; "his letters were always on the theme of love"
a unifying idea that is a recurrent element in literary or artistic work; "it was the usual `boy gets girl' theme"
provide with a particular theme or motive; "the restaurant often themes its menus"

prom
promenade: a formal ball held for a school class toward the end of the academic year
In the United States and Canada, a prom, short for promenade, is a formal (black tie) dance, or gathering of high school students. It is typically held near the end of junior and/or senior year. It figures greatly in popular culture and is a major event among high school students.
Prom is the second solo album by Amy Ray of Indigo Girls, released in 2005 on her Daemon Records label.
A formal dance, esp. one held by a class in high school or college at the end of a year