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Pick and mix" describes a retail concept, most famously associated with sweets, where customers choose from a variety of different items displayed in bins and then pay for their selection, often by weight. It also serves as an adjective or idiom to describe any situation where one selects and combines items or ideas to create a personalized combination according to their preferences.
 

In a Retail Context (Sweets)

• Customer Choice:

  Customers select individual sweets from a large assortment of different types, such as gummy bears, jelly beans, and liquorice. 

• Customization:

  This allows individuals to create a unique assortment tailored to their specific tastes. 

• Payment:

  The total cost is typically determined by the weight of the chosen sweets. 

• Origin:

  The concept emerged in the early 20th century as a way to sample various sweets from large containers in department stores and sweet shops. 

As a General Term

• Adjective/Idiom:

  The term can describe a system or approach where items or ideas are chosen from a varied selection to form a custom combination