Shaman benefits from flowing thought for sure, if you can get the items they are probably worth it. That being said, shaman already has a large amount of mana recovery through rapid worn regen, torpor, and cannibalize, so each point of flowing thought is not as big an upgrade as say a cleric, who has sit regen only. As each point of flowing thought added for the shaman reflects a smaller % increase in mana regen than other classes that are ballanced around not having self mana regen, like clerics and wizards.
Would I spend weeks working on tradeskills for a shawl on a shaman? I personally would not. I would probably just get a
http://wiki.project1999.com/Strength_of_the_Elements or equivalent and do something more productive with my time, like sleeping or playing checkers with homeless people.
If you enjoy tradeskills, knock yourself out, but be warned, if you are not a true neckbeard you will probably quit the game or get banned before you finish farming all your cat pelts.
Baking: 127
Brewing: 168
Fletching: 168
Jewelcraft: 162
Pottery: 162
Tailoring: 208