I recently bought Sentimental Johnny a movable cage platform to hang outside his door and he loves it! Once he figured out it was good to stand on he started walking all around it and even hung upside down on the bottom! He was so cute and the platform was only five bucks at the petstore.
It's the only place I give him millet now, so he comes out on his own when he's hoping to get some millet.
I also just ordered a new cage that measures 30"x18"x18" (lxwxh). I think he'll like the extra flying space room for more fun toys.
I also tried taking him to work today. One of my jobs is an internship with lots of typing, so he's sitting here with me trying his best not to take a nap. He keeps tucking up his foot and putting it back down and his little eyelids are heavy. He's being so good and nice to everyone.