First find a plain wall.
Then gather up some pictures,paper or other hang able things.
You can use tape but I would not recommend tape though because it falls a lot.
But do not worry you can get some for a very cheap price. ( I am not sure what store though also it comes in a package with 20 butterflies and 20 magnetic nails).
Ta da your plain wall is now a cool filled up space.
- Tape or some magnetic butterflies
- Paper and,or pictures