A quick google search will clarify which it is, i had also thought it was paper, but others have said its cotton in the UK.
If its paper - if she is into theatre etc.. then tickets to a show after a nice meal out. (paper tickets, get the idea)
Or if you have not had any of yor wedding photos printed, choice one and get it blown up and framed, would still cover the 'paper'.
My friend has just celebrated there first one and he used tickets as the 'paper' - tickets to a long weekend in Venice.