When it comes to synonyms for "pieced up," there are a variety of options depending on the context and connotation you are looking for. One such option could be "patched together," which implies that something is made up of various parts or components. Another synonym could be "assembled," which carries a similar meaning of putting together disparate pieces into a cohesive whole. "Mended" or "repaired" might be appropriate synonyms if the context involves fixing something that was previously damaged or broken. Other options might include "composed," "constructed," or "arranged," depending on the exact tone and meaning you are trying to convey.