There are three main factions involved, which should get you most of the red and yellow adornments: Othmir of Velious, Snowfang Gnolls and City of Thurgadin. To get all 3 of these factions, use the following links. First in EW
http://eq2.zam.com/wiki/Eastern_Wastes_(EQ2_Quest_Series)
Scroll down the the section titled
Nipik's Haven, and run through that series with the Othmir there. Take a look at each quest first, some of them don't reward faction, so you can skip those. Once finished at the Othmir camp, skip to the Great Divide questline:
http://eq2.zam.com/wiki/Great_Divide_(EQ2_Quest_Series)
Start at the beginning here, with the
Fina's Retreat and
Othmir Fishing Camp sections to finish up your Othmir faction, then continue through
Snowfang Isle,
Thurgadin Harbor,
Thurgadin,
Storm Gorge, and
Storm Gorge Staging Camp.
This doesn't take very long at all (a few hours solo, with a flying mount), and will get you to +10k for each, and enough to buy most of the adornments.
The fourth faction involved, if you're interested is Clan Ry'Gorr. At the first link posted, complete the sections titled
Ry'Gorr Keep and
Rise of Thrael'Gorr. I never bother with Ry'Gorr faction personally, because I don't usually end up buying those adornments.