The weekend project
You might need to set aside a little bit of time to put this together but the elegance factor makes it totally worth it. Start by attaching two Curtain rails to the ceiling that match the outline of your bed. Complete by attaching a light gauzy fabric to the curtain rails all around the bed with lengths of darker fabric just at the corners to give the look of a textile four-poster bed.
...or knock up in an afternoon
This version your partner might actually be happier about helping out with. Just take two poles the same width as your bed and hang them with hooks and string at the head and foot of the bed. Then roll out a big length of whatever fabric gets you feeling flowy and elegant over. Switch on some soft piano music lean back and enjoy the serenity with your new bed canopy.