In order to investigate the positive influence of implementing arts-based creativity in a foreign language classroom, an after school English-as-a-Foreign-Language teaching project was created for 5th-grade students of a Russian public school. More specifically, the study focused on how the incorporation of the picturebook creation component in a foreign language classroom can lead students into the state of flow, lower their affective filter, and influence their willingness to communicate in the L2, which is one of the most important aspects of L2 learning. The study was based on the Case Study methodology and included elements of Arts-Based Research. Multiple data sources, such as videotapes, teacher journal, visual teacher journal, interviews, artifacts, and questionnaires, were used to collect study data, which were analyzed with the help of Content Analysis and Mixed-Methods Analysis. The study findings demonstrate that the incorporation of arts-based creative activities, such as picturebook creation and discussion, can lead elementary school students into the state of flow, effectively lower their L2 anxiety and fear of making mistakes, and ultimately raise their willingness to communicate in L2.