On Oh Happy Day you can find instructions to make big decorative flowers out of brown paper lunch bags. Chiara made these to decorate a photobooth at a birthday party but I am picturing these decorating a bedroom, a stage for a play, above a table at a party or as an extra big special gift for a teacher at the end of year.
Design*Sponge also featured a tutorial for big paper flowers last year which is a little more complicated because of the structural stems but the blooms themselves are lovely and easy.
Some more inspiration:
From Brooklyn Bride