Personally, I'd like to see a bit more variety than just the Legions we're all used to.
I've just gone through this list (http://wh40k.lexicanum.com/wiki/List_of_Space_Marine_Chapters), yes, every one, and found a list of the chapter Icons I like the look of (Asterisked ones, especially so)-
Angels of Vigilance
Aurora Chapter
Avenging Sons
Black Dragons
Brazen Minotaurs*
Brotherhood of a Thousand*
Celestial Lions*
Consecrators*
Dark Hunters*
Dark Sons*
Death Spectres
Disciples of Caliban
Emperors Spears
Exorcists*
Flame Eagles*
Flesh Tearers
Genesis Chapter
Golden Gryphons*
Guardians of the Covenant
Hospitallers
Howling Gryphons*
Iron Lords
Iron Snakes*
Knights of Gryphonne*
Lamenters
Lion Warriors
Mentor Legion
Novamarines
Praetors of Orpheus*
Raptors
Red Hunters*
Red Scorpions*
Red Templars*
Relictors
Salamanders*
Scythes of the Emperor
Sons of Guilleman
Sons of Orar*
Space Wolves
Star Dragons
Storm Hawks
Storm Wardens*
Tigers Argent
White Minotaurs
White Panthers
White Scars
Those are my choices anyway
.
I've just gone through this list (http://wh40k.lexicanum.com/wiki/List_of_Space_Marine_Chapters), yes, every one, and found a list of the chapter Icons I like the look of (Asterisked ones, especially so)-
Angels of Vigilance
Aurora Chapter
Avenging Sons
Black Dragons
Brazen Minotaurs*
Brotherhood of a Thousand*
Celestial Lions*
Consecrators*
Dark Hunters*
Dark Sons*
Death Spectres
Disciples of Caliban
Emperors Spears
Exorcists*
Flame Eagles*
Flesh Tearers
Genesis Chapter
Golden Gryphons*
Guardians of the Covenant
Hospitallers
Howling Gryphons*
Iron Lords
Iron Snakes*
Knights of Gryphonne*
Lamenters
Lion Warriors
Mentor Legion
Novamarines
Praetors of Orpheus*
Raptors
Red Hunters*
Red Scorpions*
Red Templars*
Relictors
Salamanders*
Scythes of the Emperor
Sons of Guilleman
Sons of Orar*
Space Wolves
Star Dragons
Storm Hawks
Storm Wardens*
Tigers Argent
White Minotaurs
White Panthers
White Scars
Those are my choices anyway