Hobby Lobby cardboard letters painted with metallic spray paint. They're so light you can hang them using 3M sticky strips. Much cheaper than Anthropologie at only $2.50 a pop. Do "wash" for the laundry room.
Homasote. This is technically a compressed fiberboard product that is sometimes used for soundproofing and insulation. Great for large bulletin boards because it takes pins really easily, you can cover it with fabric, paint it, or frame it. It's about $12 for a 4 foot x 8 foot sheet. - Cheaper than cork sheets at Hobby Lobby.