Simple message in the bedside lamp - this is perfect for a white or pale lampshade. I printed the words on transparent A4 printing sheets - the ones you use for overhead projectors.
Cut to size and sticky taped in...Remember to only do this with led low heat bulbs!
For heavier shades a stencil cut from baking paper seems to work.
And best of all - the message can't be seen when the lamp is off...
.....so it's a romantic surprise when the lamp is switched on!