I have a hard time with themes. I start off the year with all the ideas of having a theme and pulling everything together but by October my theme usually dies out. This year I have decided instead of a set theme I'll stick with a specific color theme and not worry about being cutsie with everything else.
My color theme is: pink, green and browns. I have been moved to a relocatable classroom (also known as a portable) which is very old, yucky and has tiny windows. Thus I decided against using blacks and have chosen colors that are bright and will add to light not take it away.
I previously bought pink and green book bins from reallygoodstuff.com and decided that I love those colors and would love to use them throughout my classroom.