Hang Seng- Hong Kong index
Nikkei- Japanese index
Commodities:
Aluminum
Natural Gas
RBOB
Brent Crude
Uranium
Wheat
Ethanol
Orange Juice
Sugar
Pork Bellies
Rice
Propane
Palladium
Platinum
Corn
Steel
Coffee
Butter
Milk
.........
If you are going to have indexes, don't forget:
NDX
OEX
QQQQ
.........
You can also do:
ETF's
Double and triple leveraged ETF's
Short/inverse ETF's which can also be double triple leveraged i.e. FAZ