Heres a great example of some 2-dimensional conceptual design that I found on a napkin in an Italian restaurant called ‘Ask Italian’. It is promoting dining in the restaurant over the Christmas period.
The first part of the design that caught my eye was the star and snowflake shapes and how they symbolise the festive/winter period. But then, if you look closely you will be able to see that the stars are actually made up of penne pasta shapes, this ties in with the Italian theme of the restaurant.
The napkin also has another example of conceptual design on it – the designer has changed a letter ‘A’ which is on the restaurants logo at the bottom into a Christmas tree. Overall I feel like this is a very subtle but effective way of using conceptual design.