"In addition I hate staring at a grey wall the whole day. It feels like prison." You can cover that up with stuff. One of the benefits of a fabric covered cube

"In addition I hate staring at a grey wall the whole day. It feels like prison." You can cover that up with stuff. One of the benefits of a fabric covered cube wall is that you can use pins to stick things up. I went to a fabric shop, got a bunch of the remnants that they sell cheaply, and put them all up over the gray.