Nikki, the design and development manager at Holden Outerwear, says she likes "taking something everyone does every day and doing it slightly different." A workplace that provides the freedom that Nikki promotes has a

Democratic leadership style

Explanation:

Based on the information provided it seems that Nikki's workplace has a Democratic leadership style. This refers to a type of leadership style in which the members of the group take a participative role in the decision-making process. The phrase "taking something everyone does every day and doing it slightly different." shows that the company allows it's employees to make their own decisions as long as they get the desired results.