Change color of images

I need the color of the furniture pieces all changed to different shades of grey and reversed. There are 50 similar images and I want to stay low budget, (under 25.00) as this is an introduction project requiring basic Adobe. We will be giving much graphic work like this to follow. In a few images, a pillow would need to be removed like in this example. We will send all 50 images to you at once upon agreement.