You’ve heard wrong.

This cannot be done on a computer.

I’ve never heard of that….interesting.
When I was a kid, we collected baseball cards. Dad let us put a dot of glue on the back of each card and we covered one whole wall. Do you like baseball cards ?
I have put regulation wallpaper up in many rooms and it can get a little pricey. Most stores that sell wallpaper end up with extra rolls from the end of a case or rolls that someone has returned. They are usually marked way down from original price because they want to get rid of them.

you print a design and put glue on the back! Taa-da