Interior Design Trends For 2010: Layered Floors & Wallpapered Ceilings
Even then, there can be too much of a good thing... CountryLiving.com
If your rooms are rectangular, have high or vaulted ceilings, woodwork, or ceiling fixtures, wall paper can enhance their structure beautifully. Design Crisis
How would you like to have a master bath like this one? Architectural Salvage. Ceiling medallions and stencils, many of which can be painted to match or contrast with your ceiling, are made of many materials (plaster, metal, plastic, etc.) and offer great texture... The higher your ceiling, the more texture you can afford to use.
Look at the effects created by this Victorian bed vault! DesignHole
Here is a great design effect created by faux ceiling tiles and wood paneling... Classic Wall Coverings
Of course you could go the way of the Russians and create a 24/7 live sculpture, expandable ceiling that changes its shape depending on where and how much water is leaking in the apartment above.
There are many special touches you can bring to your floor and ceiling designs on your own. Creating patterns with rugs is so much fun. You'll have more fun with wallpapering your ceiling, however, if you get a few pointers, so here's a place to start.