One of the best ways to develop creative skills is to set up a student society. This will give you a lot of opportunities to exercise your creativity. You will need to figure out how to attract members, raise cash, organise events and more. These all require initiative, but this is also an excellent forum for brainstorming innovative ideas.
Another good place to try out your creative skills is at a part-time job, or even on work experience or internships. This is more likely to happen at smaller organisations, since you will need to agree to test out the idea with the manager. You will need to agree a benchmark for success and measure the popularity of the project.