voted on box wave for a keyboard buddy case for nokia lumia 800 and nokia n9. linked pics to both devices, and linked pic to nokia n900 keyboard and n950 keyboard so they get the idea

what would also be a freaking good idea is that when you want to use the bluetooth keyboard you can swipe to a custom made virtual keyboard on the screen that has smilies set up, like the n900 has, thus taking up one line at the bottom of the screen maximising screen realestate. this would also stop the real vkb's initialising and becoming an issue when typing in a text area.
can the vkb display dynamically change size if you made the vkb one line high with one button at the left edge, if pressed to change to a 6x3 line keyboard of presets for common gestures and then when pressed returning to the 1 line high presentation? is that possible?