I'm going to get this ball rolling then. Not a fully fleshed out thing but let me pitch my filler arc idea.

Garra's Journey: This arc would involve Garra going throughout the sand village in an attempt to learn about his father the late KazeKage. Garra is not quite sure how to deal with his death so he wants to understand what kind of person his father was. Was he really as cruel and cold hearted in life as he was to Garra? Garra travels throughout the sand village and speaks with various people from the village. Some are ninja's, others are local shop owners, some are magistrates and political leaders. Each one he visits reveals a different aspect that he never qutie knew about his dad. He finally confronts Temari and Kankuro and asks them what their experiences were like with his mother and father. After spending several episodes on his self-reflective journey Garra goes to visit his father's grave as the sunsets on his past and comes to terms with his childhood traumas. As dawn breaks and the sun rises Garra sets off to ensure the beginnings of a bright future.