You cannot go wrong with a classic square-style sticker. The clean, crisp edges and simple-but-elegant look make this the most straightforward message. 
 
 
 
 

  .: For indoor use 
 
 
 

  .: Four sizes to choose from 
 
 
 

  .: Not waterproof 
 
 
 

  .: Grey adhesive left side for white stickers