Art.

[TheRecklessPlaneswalker]

What's your favorite,most beautiful, most colorful,etc... That you can think of?

[LinkCelestrial]

I really like foil artifacts in general. They look crisp and at the right angle they're just a neat shade of blue.

[jonrox3]

I think that {tower drake} from rtr has the most badass art.

[TreeSmoker]

Birds of paradise from core sets and Xenagod and nylea god

[lotrwk]

Unhinged island

[Spencer Addington]

Straight up {Enter the Infinite}

[Munchlax]

{Donate}, {Priests of Norn}, or {Mojyin Of Life's Web}

[rarehuntertay]

Too many to name:
Original  {Balance}
{Natural Selection}
{Storm Seeker}

[FustyDavorite]

Straight up {Enter the Infinite}

second this allllll day long.

[LinkCelestrial]

{Pennon Blade} in foil.

[Stromack]

{Baneslayer angel} foil
Original {progenitus}

[Mlerner12]

Foil {Omniscience}

[Wingnut]

 {Wurmcoil Engine}, such a nasty picture. For beauty,  {Angel of Serenity}.

[cltrn81]

{sorin markov}, {vampire nocturnus}, promo {sun Titan}

[NovusOrbis]

{Silent Simulacran} or however you spell it from the core set, or The full art Fitemane Avenger.