I love clutter, and most of the CC I use in game are clutter objects. It helps my builds feel a little more lived-in, and adds some personality to each sim's space. As a rotational player, it really helps to individualise the different households: I want all (okay, most) of my sims to succeed in life, but eventually that means they're all going to eventually end up with almost the exact same top-range furniture in their homes in a very small range of colours. At least I can distinguish between them by having a range of fruit bowls, books in questionable places, and some other weird assortment cluttering up the dining table and mantelpiece.