Fenders, Racks, Locks, oh my!

[Biking on Bainbridge]

What have you installed on your Propella bikes? Any fenders, cargo racks, lights, water bottle holders, locking systems, dog trailer, cat baskets, wings, skiis, disco ball.....

I'm particularly interested in simple elements that blend in well with the original design. But I'm also curious about anything you have tested, and what you think of it!