Mag Chalkboard Paint: Paint a wall, have some craft activities to have her make castle/house/outdoors/etc pieces (modular ideas so she can build the castle in many different configurations). Also could use chalk to outline and draw.
home made notice board and cute button pins
Regan's Closet Memo Board : Home Decor Fabric Projects : Shop | Joann.com would be cute for the girls to each have one in their rooms.
fabric covered tack board tutorial
boards chewed by the horses? ... Use them for floor boards and crown molding in the tack room etc! Brilliant!
Gravity Home Más
Photo Walls That Every Home Needs #Homecraft #PhotoWall
Pink and Black Damask Candy Pink Frame Cork Board Damask Pin Board 17x11 Tack Board Cork Bulletin Board Cork Message Board Corkboard by kayskrafts on Etsy
Spray paint bulldog clips and attach them to the wall with sticky tack to create a gallery wall with Polaroids.