In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
Q: in architectural decoration small pieces of colored and iridescent shell have been used to create mosaics and inlays , which have been used to decorate walls , furniture and boxes.
A: 
small pieces of colored and iridescent shell were used to create mosaics and inlays on walls , furniture and boxes.