Where business ideas may come from:
The sources of ideas may include brain-storming, your own personal experience and your business experience.
Examples of small business innovation here.
Intrapreneurship:
Acting like an entrepreneur within a larger organisation. The term is derived from a combination of "intra" or internal, and "entrepreneurship."
Intraprenuers are usually highly self-motivated, proactive and action-oriented people who are comfortable with taking the initiative, even within the boundaries of an organisation, in pursuit of an innovative product or service.
The major difference between entrepreneurs and intrapreneurs is that the fruits of success default to the organisation rather than to the intrapreneur.
On the other hand, the intrapreneur also has the comfort of knowing that failure will not have a personal cost - as it would for an entrepreneur - since the organisation would absorb losses arising from failure.