My S.O. received today here Fairphone3+ pre-configurated straight from /e/, and it came with a range of stickers 
The smallest ones were already used to seal the box, but detaching them carefully I got the idea to slide one of them besides my own Fairphone3 semitransparent back cover.
Here is the result! (with two other stickers around it)
Indeed I find it quite cool : efficient, cery visible and discreet at the same time…
The other stickers will land on our laptops 
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services