As far as I am aware, themes and enviroments do not dissapear over time. I have not seen any warnings about this, so I'm going to go ahead with this.
My Guild, Flawed, had bought the themes/enviroments , and now they are no longer visible in the guild hall. I'm not too sure wether this was meant to happen or not, but I'm pretty annoyed that the enviroment and theme cannot be seen anymore. Halp?
>.<

-Ariav