There's a number of resources that don't integrate all too well with the rest of the mod, in terms of buildings and corporations. Examples:

Flax: Does not get a health bonus from granary, nor is it part of the three-field order.
Amber: A a kind of gem, it doesn't seem to tie into anything. I forget what else uses gems...
Sugar: Also doesn't seem to tie into anything.
Coffee: Again no guilds or buildings seem to affect this.

Flax: used by intricate weavers & kurio tailor
Amber: Hansa
Coffee: Transmuters

Sugar - not used. Transmuters? Brewerer's guild might be a good idea, but there is brewery & dreptus already, so I will probably just add it to these....
Also, I think of rum production for Lanun.

Rum sounds rum :) Call it Demonspit Rum and make it a Wonder that's only available to the Lanun.

The Intricate Weavers building could provide a free Superior Sails promotion to all Naval units which gives a +10% withdrawal chance.

The Theatre of Dreams could provide two Classical Farces (use the Musicals icon from the main game).

I guess there's so many guilds its hard to tell. It would still be nice for all of the resources to have an enhancing building early on, much like how the regular resources do (smokehouse for meats, granary for grains).

Two more 'neglects'.

Order of Arches could consume Olives - They use it in scented oil lamps inside the impressive buildings the order creates.

Guild of Transmuters consume Whale - The ambergris is turned into perfume and the fat is rendered into oil and margarine.

Actually I think whales needs to be allowed earlier and be really, really valuable considering how much whale oil lamps really were the way to go prior to electric lights.

You can use any liquid fat for oil lamps. I think olive oil was the most common.

@Wauthan
I agree, olives and whale need extra uses. I am a bit reluctant to add olives to arches, though. It will enable spreading the guild to the cities with olive resource only (no copper or marble)... Secret freemasonry rites? :crazyeye:

Perhaps make cathedral (arches building) give some bonus to/from olives? Not cumulative but every little bit helps.