Technically, there's no such thing as a right or wrong build for any hero. On that note, I share some of my experiments:

Support Void - Orchid, Meka, Arghanim's, Refresher
Support POTM - Orchid, Meka, Dagon 5
Carry KOTL - Deso, Buriza, MKB, Butter, Heart
Carry Techies - Arghanim's, Buriza, MKB, Satanic, Hex

All played during DotA 1. MM on DotA 2 doesn't give one much space to try out troll builds.

riki with lothar and am with dagger

I have seen a video about AM with dagger and Dagon, damn epic,
Here the vid:
http://www.youtube.com/watch?v=LLOlGkipXyU

Last i play i meet a tuskar with this item build, dagger + dagon + ethereal blade
his method, throw ice 1st + charge ulti, blink in dagon then walrus punch!! dead in a second, damn epic. Its somehow funny that when we teamfight he just jump in kill the support in an instant. when he rich, even carry cant stand all the burst skill damage include ethereal blade. Pretty epic gameplay, and when i check his dota profile, most successful is tinker, that make me go like "ahh, no wonder". But still, quite and epic build. worth a try.

Dk with guinsoo and eul