I love obscure tribal decks and decks with a really odd and not often played theme. So far I’ve made the following decks in order of favorite to least favorite:

1. Unicorns (the most amazing tribe in the history of ever): Unicorns! (My EDH Masterpiece)
2. BW Lifegain/Control: Karlov the Ghost Daddy's Weight Loss Program
3. Eldrazi: Eldrazi Speedracer
4. Make your opponents take damage from talking: Censorship, the Deck
5. Pure Chaos: CHAOS! CONFUSION! POWER!
6. Respect your "Elders": The Senile Old Farts
7. Boros Equipment: Ardenn Equipment Mania
8. Mono-Red Everyone Draws Cards: Devilish Draws N Damage
9. Put counters on (and goad) your opponent's creatures: Cookies...er..Counters for Everyone!
10. Treasure.dec: Tiamat’s Treasure Hoard
11. Tons of value from playing multicolor cards: Multicolored Goodness
12. Lobster: Lifegain Burn
13. A deck based around the word "Unless": "Unless" (A Deck for Sadists)
14. Make a bunch of saprolings: The Saproling Horde Descends
15. Double damage and extra combats: Double the Double Pain
16. The "Nic" deck: The "Nic" Deck
17. My attempt at red and green control: If Gruul was Blue
18. Cleric lifegain: Minawuwuwuwu Clerics
19. Morphs (with Kaust): Bigger than they Look
20. Morphs (with Animar) (retired): Morphs "Will bender" your mind O_o
21. Mono-White Equipment (retired): Balan Equipment Mania
22. Saprolings/Ghave good stuff (retired): Saprolings Unhinged
23. Prismatic Bridge and Fatties (retired): deck:BIg dUMb CrEAtUrES!
24. Golgari Destroy all the things (retired): Chevil: None Shall Escape the Slaughter
25. Coin Flip (retired): Freaky Flip Tribal
26. Simic Auras (retired): Ivy and her Mystical Auras
27. Unicorns V.2 (It's all Unicorns and you can't convince me otherwise) (retired): Unicorns v2.0.... or is it???
28. Pegasi (retired): The Second Best Tribal
29. Landfall and Sea Creatures (retired): The Landsharks
30. Enchantress pillowfort (retired): Fluffy Enchantments
31. Enchant (and goad) all of your opponent's creatures (retired): Kaima, the Charitable
32. Haste Tribal (retiured): The Speedy Bois
33. Give bad gifts to opponents (retired): Creepy Donations
34. X Spells with Hinata (retired): Hinata Hates Everyone Equally
35. Mono Blue Scrying (retired): Go Scry About it
36. Shadowborn Apostles (retired): Shadowborn Apostle Death Sentence
37. Cards with flash and etb effects (retired): Splashy McFlashy
38. Proliferate good stuff (retired): Atraxa Energy/Proliferate
39. Avatar Tribal (retired): Avatars, but not the Airbending Kind
40. Board Wipe in the Command Zone (retired): Piru, the Thirsty
41. Deathouch becomes infect (retired): This Deck is Toxic
42. Pile tons of counters on the commander (retired): The Odd Counter Cat
43. Dwarves and Vehicles (retired): Budget Dwarves/Vehicles
44. Enchant opponent's creatures in BW (retired): Oops! All Pacifisms
45. Wizard/Warrior/Cleric/Rogue party good-stuff (retired): Tazri's Party Pals
46. Wurms (retired): WUUUURMS!!!
47. Mono Black Enchantress (retired): Horobi Enchantress
48. A deck where every card is random (retired): Random Tribal
49. Lands, and basically nothing else (retired): Lands... and basically nothing else

I also have two deck lists on this site that I helped my wife make. The first deck centers around Mowu, Loyal Companion, and the second deck focuses on as much flier synergy as possible with Alela, Artful Provocateur as the commander. I'm not going to rank those decks since they aren't mine, but the fliers deck is definitely more fun than the Mowu deck.

I have several decks that I am in the process of brewing, and I will list them when they are finished.