Technique for generating business idea

A business idea is a concept which can be used for commercial purposes.
It is typically centers around a commodity or service that can be sold for money,according to a unique model.
The following are query in picking a product or service:
Is their a better method of doing this?
Can I make it bigger or smaller?
Can I add something to it,substracts something from it,or rearrange the order of things?
Can I combine this with something?
What if I do the opposite of this?
How can I make it better,faster,or cheaper?
How can I give this a new twist?
What else can I use this for?
Who else need this?
How can I make this more marketable?

Here is my opinion on how to create your own unique business idea