Asymmetrical : having parts that fail to correspond to one another in shape, size, or arrangement. 

Let's literally go with KEYS!  They are a common enough item and one we all probably have too many of.  I tend to hang on to keys.  I have an assortment of keys, some of which I no longer even know what they are meant to unlock! 

Find some keys and see if you can photograph them asymmetrically by size, colour, or arrangement.