Unsellable only means you can't sell it to NPCs. Crafting shards are also unsellable, yet you can sell them on market board.
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they said ifrit's horn will be used to make a wall hung trophy, and titan's heart will be used for a table centerpiece
no clue what garuda's feather will be for though
Asking price for Titan's heart is around 5m here, 1m for feather and ~ 15 mil for ADS ingot.
http://youtu.be/Z_15TJde09E?t=1m3s
EDIT: Found a better angle in the same video. Jumping the gun ftw!
So, ADS Frame, ADS Plating and ADS Illuminant. I think 1 drop per turn except 3rd and 4th one (since there is no "the" boss). And it makes Twintania to drop furniture item too. Which hasn't been beaten. Which can be beaten once per week. With 1-5% drop rate. I wonder what will be the price ...
WTS 1 ADS Plating and 1Titan Heart on Ragnarok
You can not put Ifrits Horn in market ward so I assume this is the same.
Ive heard shouts for garuda's feather for 700k and Ifrit's horn for 500k on Balmung server..
I got Ifrits horn on a run so I'll probably donate it to my FC for housing.