The Gryffindors have a large scarlet bulletin board, five feet by three feet, up in their common board. Anything can be posted on here, as long as the head of House, Professor McGonagall, isn't displeased by anything. Students can post gossip, class schedules, Quidditch practice schedules, photographs, et cetera up on this board. Of course, if someone puts swearing in a note, and McGonagall finds out about it, she will rip it down and the student who posted the note (if she knows who it is) will get into trouble. But don't gfear having your character post a naughty note or graffiti.. you, personally, won't get into trouble with me.. just your character with the Head of House!