A creative proposition is an idea that has been given form and detail in terms of both the realisation and scope of the idea.
It is different from a thought, or a thunk. It is at this point that it is possible to associate commercial value to an idea. A film script is a creative proposition, and idea for a film however detailed is no more than a thunk.
The overall process of creativity can be considered as a progression from: - Thought - Thunk - Creative Proposition - Implementation