It may be interesting and constructive to get some feedback from your experience during this week-end of farming greens all across Cantha.
Please post which boss did you farm, how difficult was it, how do bypass this difficulty, etc...
To start with, I will give you mine:
Warrior Bosses:
Geoffer's Bulwark, Jacqui's Aegis and Arrahh's Aegis: I've used the N/Me solo build from wiki, using also henches and heros either to take down the group of Nagas that engages Geoffer's group, or trying to destroy any group that this Leeroy Jenkins aka as Jacqui the Reaver may engage.
Sunreach's Shield: using the A/E build, very fun to use, quite some time to get used to, but finally managed to get one shield!

Ranger Bosses:
Lorelle's Longbow: I've used a W/X + M hero linker build to get this one, quite hard, glass arrows+needling shot+double damage for Canthan boss is a huge pain, and don't forget to bring an interrupt for his troll ungent.
Nundak's Recurve Bow: the N boss going with him and the toucher mobs around makes it a difficult task for me, finally I get it by using the hero flag system, killing him with a N master minions build!

Monk Bosses:
Hukhrah's Staff: Clear all the way to his location with hench and heros, but don't kill the yetis around him. I've used a SoA build, with both Visages and IW (yeti Rits with their blinding spirits are a pain in the ***) to drain him from
his mana, also bring watchful healing to counter the poison traps set around there.
Kaolin protection staff: this one was a bonus with a full team of heros+hench on my way to the Warrior construct!

Sin Boss:
Urkal's Kamas: Clear the way with hench and heros, pull him with a longbow and kill him with a Riposte W build, quite easy...
Mesmer Bosses:
Hanaku's Focus and Siska's Staff: clear the mobs with the hench and so on, flag and use a W/Mo build, based only on adrenaline and 2 perma ench, very easy farm.
Kenrii's Sorrow: easiest farm on the earth, go there with full team, clear, flag, kill him.
Milefaun's Staff and Swiftspell's Staff: those 2 ones were harder, shattering enchant and energy denial for the first, and environmental effects (stone spores) for the second, after several attempts with different builds, I've finally used my N master minions technic used with Nundak and it works quite well!
Bezzr's Wingstorm: I've tried an A/E shadow form build, but it was quite hard to get Bezzr targeted by sliver armour...didn't succeed to get his wand...

So in resume, this week-end was worthy, 15 greens for me, to enlarge my collection, but please Anet if this kind of week-end should happened frequently, please give us more storage space!

Please, feel free to comment, argue and give your feedback.
Heng.