And I did this project for Ninitchi as it is a rainy and windy day:
A butterfly "wallpaper". What I do is, I cut out small butterflies from old bookpages. Then I glue them onto the wall with paperglue. If I want to remove the butterflies, I just make them slightly wet and gently remove them.
Here is a closeup of the butterflies, so it is very easy. You can use my butterflies as a model if you wish.