A service that lets you try high end items before you buy. So example speakers or TV or drones, you get to try them for a week and then decide if you want to keep it. If you do you're charged the price of the item, if not you can return it for free. My idea was to charge brands for the service and handle fulfillment and we keep a % of sales made.
I could see this concept working and getting lot of attentions, but I'm not sure how you could make it profitable with all the returns and exchange to handle.
+ Shipping cost are very high for large items like TV if you pay for them.
I would suggest you read the book on Zappos for some comparable example of customer focused business