http://www.bobblick.com/techref/projects/projects.html
Switch you TV lamp while comfortably seated on you armchair, using your TV remote control
http://www.nutchip.com/progetti/tv_light_en.htm
http://www.web-ee.com/Schematics/Bug_Zapper/zapper.htm
http://circuitos.tripod.cl/schem/r101.gif
a mini-central that tells you when a letter is waiting you in the mailbox and if someone rung your bell when you were not at home.
http://www.nutchip.com/progetti/postino/postino_en.htm
flashes LEDs mounted to christmas tree shape PCB.
http://www.grantronics.com.au/tree.html
http://circuitos.tripod.cl/schem/r16.gif
A bingo or lottery generator.
http://www.riccibitti.com/bingo.htm