The bottom line is: you can use the background you want, but people can (and will) judge you if given the chance to see it.
No matter how much you think it's right or wrong, is simply how things are. So if you prefer to avoid problems with your parents, acquaintances, coworkers and anyone else who happens to have access to the device, ideally, you should use a neutral image. If you don't care about the opinion of others, then by all means, use whatever you want. After all, is your cell phone/desktop/notebook. But you will have to live with the (usually negative) reaction from other people.
And no matter how much effort you make to justify or argue that they should not judge you for it, they will do it anyway.