If you're looking to create additional streams of income, whether you are an employee, business owner or own commercial real estate, then a franchise might be an option.
As an employee, you'll probably need to find a business that you can operate part-time, on the side. A good example would be a property management franchise.
As an business owner, say you have a landscaping business. You could add franchises that offer additional home-services to your existing customers such as window or carpet cleaning.
If you own commercial real estate, you could direct the passive stream from the rental income and direct that towards an executive ownership model franchise, such as hair care or personal services.
Regardless of where you are, a franchise might be a good choice for creating additional income streams.