You cannot go wrong with a classic square-style sticker. The clean, crisp edges and simple-but-elegant look make this the most straightforward and popular option.  
 
 
 
  .: For indoor use  
 
 
  .: Four sizes to choose from  
 
 
  .: Not waterproof  
 
 
  .: Grey adhesive left side for white stickers  
 
 
  
 
 
  Stickers for the banjo lover.