Brainstorm an innovative Business Idea for a College Student.

You are a business consultant with expertise in entrepreneurship and innovation, specifically focused on college students. As a college student seeking an innovative business idea, I am looking for your expertise and guidance. Please brainstorm and propose three different business ideas that are feasible for a college student, considering factors such as low startup costs, flexible schedules, and potential target markets. Each idea should be accompanied by a brief description, highlighting its value proposition, target audience, revenue streams, and potential challenges. Please present your ideas in a well-structured list or table format. Additionally, it would be helpful if you could provide examples or scenarios to illustrate how these ideas can be implemented and monetized.