Here's one to kick it off. With this arrangement you get the look of a 4-track main, with basically a double-track dogbone. On this end the flyover accomplishes a reversal with inside tracks becoming outside and vice-versa. On the other end I'd go with a complex-looking switch arrangement with additional tracks at a larger station and continue the 4-track look along one side of the loop. If done correctly, the inner track of the loop can act as staging and allow trains approaching from either side to pass around.