I recently brought a brand new how and i am teching it up so to speak as well

Here's what i'm doing you might like some of them
Stair Lights
http://alan-parekh.com/projects/stair-lights/These are leds you can put on your stairs or anywhere you want really and it uses an IR Beam to detect when your at the top or the bottom of the stairs and turn the lights on. The cool thing is that if you walk up or down the stairs then the leds go off one by one based on the direction you first tripped the sensor. Watch the video to understand what i mean.
LED Coffee/Dinning room/ Table
http://evilmadscience.com/majors/46-tables[youtube]http://www.youtube.com/watch?v=IkmpIXd9Q90&feature=PlayList&p=9FB3E52B52A663F9&playnext=1&playnext_from=PL&index=9[/youtube]
This is a interactive led table it uses IR sensors to light up a certain set of leds it also twinkles when there is no movement it's quite cool and you can buy either the tables or the panel kits assembled or save money assembling them (i have assembled one board and it's easy as)
LED under cabinets in the kitchen
[youtube]http://www.youtube.com/watch?v=2tgmWeNL0SQ&feature=related[/youtube]
Now you can go all out or you can do something simple like i am and just use white leds at night but it's the same as the above video
LED Faucet / LED Shower
Thinkgeek and other places
[youtube]http://www.youtube.com/watch?v=p70uqbIw3aI[/youtube]
These are led faucet adapters (altho u can buy new faucet taps that are powered by by a small turbine so no batteries) which turn blue for cold water and red for hot water they also have them for showers and they are powered by a turbine
Backlight for plasma screens
[youtube]http://www.youtube.com/watch?v=3qETjgcSvQk&feature=related[/youtube]
Philips has one that changes colours depending whats on screen but i myself am doing soft white led lights no flashing no colour changing.
LCD hidden in a mirror
[youtube]http://www.youtube.com/watch?v=QvaUx66GGcM&feature=related[/youtube]
I got some 2way mirror tint on ebay for $50 and i tested it out with a 17" lcd and it works great im gonna pit it in my bathroom the size i have is 120cm wide and 1.5meters long which is more than enough for a huge bathroom mirror

LED Backlighting for bathroom mirror
http://www.instructables.com/id/Custom-Mirror/The same concept just leds
There are loads more like my own web interface to select movies and watch them
and a touchscreen table for boardgames etc (hard to explain)
V1
http://i7.photobucket.com/albums/y279/aussie_ninja/dvdflow.jpgV2
http://img17.imageshack.us/img17/8555/dvdo.jpg