Blue is just the preferred color, basicly any other would do also.
Resources needed:
Iron -
Lumber -
Aluminum -
Marble - Twiqz
Coal - jaguar warrior
Gold - jaaakko
Silver - Temetrix
Gems - jaguar warrior
Water - Temetrix
Wheat - jaaakko
Fish -
(Extra = pigs)* - Twiqz
Bonuses (without extra): Construction, Steel, Fine Jewellery, Beer.
Effects (without extra):
Initial infrastructure cost: -39%
Infrastructure upkeep: -18%
Population increase: 16%
Citizen income increase: $6.5
Population happiness increase: 12
Initial land cost: -5%
Purchased land area increase: 20%
Natural growth increase: 0%
Technology cost decrease: -5%
Environment increase: 10%
Environment decrease: 0
Soldier increase: 28%
Soldier cost decrease: $-3
Soldier upkeep cost: $0
Tank cost decrease: -5%
Tank upkeep cost: -5%
Aircraft cost decrease: -8%
Aircraft upkeep: 0%
Aircraft limit increase: 10
Cruise missle cost decrease: 0%
Cruise missle upkeep: 0%
Nuke cost decrease: 0%
Nuke upkeep: 0%
Water increases number of citizens per mile before population unhappiness by 50.
* For the extra slot I was thinking to have lead (it would enable scholars) or Uranium, but basicly any resource will do.