Here are some that were posted by Jude on the C&D forum.
They utilize wooden bulbs but I see no reason why you can't
use regular burnt out lightbulbs for these.
http://www.hobbylobby.com/site3/projects/HL-095/HL-095.htm

Here is a link that might be useful: Light Bulb Projects

A cute snowman:
http://members.surfsouth.com/~patches/freebie_01.html

Another really cute snowman:
http://www.fabulousfoods.com/holidays/xmas/lgtbulbsnwmn.html

Cute Angel:
http://www.thefamilycorner.com/homegarden/crafts/lightbulb_angel.shtml

Penguin:
http://www.thefamilycorner.com/homegarden/crafts/lightbulb_penguin.shtml

Cute & Easy Santa:
http://www.thefamilycorner.com/homegarden/crafts/light_bulb_santa.shtml

Mouse:
http://www3.bc.sympatico.ca/akb/lightbulb_mouse_orn.htm

Hope this enough to get you started!
Jill

This is one of my favorites, but it's not painted. I think they are stunning: Rosie's Bulbs

Here's another santa bulb: Santa Bulb The site plays music so it might take awhile to come up.

Higher quality/talent snowman: Frosty the Light Bulb

Here's a sweet reindeer: Reindeer Bulb Site has popup ads. :(

Something different: Light Bulb Duck

High definition santa: Designer Santa

This is another snowman, but it has step-by-step pictures: Snowman Bulb

Between my post and Jill's you should be busy for days! Good luck!

Allison

Here is a link that I had saved in my favorites,
Lots & Lots of lightbulb things
Cherie

Here is a link that might be useful: lightbulb art link

This is the way I make super cute snowmen ornaments:

http://www.ehow.com/how_4452042_recycle-light-bulbs-snowman-ornaments.html