melting pot 
noun
1A pot in which metals or other materials are melted and mixed.Mr West, who joined the company in 1943, said the typesetting was done by hand, using steel type or by using complicated-looking machines with melting pots.
1.1A place where different peoples, styles, theories, etc. are mixed together: Toronto is a melting pot of different cultures...
- The resulting exhibition is a melting pot of different styles and ideas - the only common theme being the small size of the artworks.
- We're a melting pot of different cultural traditions, without the commonalities to bind us all together.
- Tone-on-tone or monochrome colour combinations keep this melting pot of styles together and ensure a look that is not too loud.
Phrases
in the melting pot