One option would be to get double-sided transparent adhesive strips that are specially designed for sticking on walls

You can find these in all common hardware stores

with rubber closure on the bottom

MusicPrinted® – Weihnachtliche Erinnerungen

Design your personalized acrylic glass directly online – with a live preview

Familienanhänger (Mutter + 1-4 Kinder) - Personalisierter Schlüsselanhänger Color:Transparent One option would be toGOOD REASONS FOR A PERSONALIZED KEYCHAIN by MusicPrinted 1. Perfect gift idea Our key rings are perfect as gifts for all kinds of occasions. For example, for your best friend's birthday, as an anniversary gift for your partner or for Christmas. 2. Unique & Personal No more boring and impersonal gifts. Our keychains are 100% customizable. This means that each individual item is unique and a real eye catcher! 3. Memories for eternity With our keychains