You will need: 
Hot glue gun or Thin wire
Acorns
Ribbon or string 
Paint
Glitter and glue (optional)
Little items to go with the Holiday your are making it for like holly for Christmas and little bells.  Orange leaves for Halloween, Easter you could use some tiny plastic easter eggs 

 

Instructions
A.  Paint or use glue and glitter on the surface of the little acorns

B.  Attach your arcorns and other decorations to the ribbon or string