selling oil for Euros, not sure if Saddam had gotten around to it prior to the sanctions.
As far as what would happen, that depends on which country your in and what currency your debts are in. China is selling off their dollars from bonds and trade and stocking up on oil, not sure what they are up to.
http://www.financialsense.com/Market/archive/2003/1118.htmlsnip>
Most Opec members are Middle East nations, and their purchasing power has declined sharply vis-a-vis their commercial partners thanks to the dollar's fall. Many have euro- or yen-denominated debts, raising their foreign debt servicing costs.
For oil importers, Opec's decision means energy import bills will continue to stay hefty, potentially putting trade balances under pressure and spurring inflation.
This is particularly true in high-growth Asian countries.
As Asian countries align their currencies closely with the dollar and have more yen-denominated borrowings, they face high oil prices and debt servicing costs.
Among many other emerging market oil importers, though, the dynamic is far more benign, thanks mainly to currency appreciation against the dollar.
Turkey's currency, for example, has risen 15 percent against the dollar this year, making its oil purchases that much more affordable.
Chile's peso has climbed 19 percent to a 37-month high. Both countries' dollar-linked debt have become easier to service.