Big circle with three projections is a washer for the oil filter housing bolt.
Half circle is for the lower plastic timing cover to keep dust out.
Each set of six o-rings are for the injectors. Pull them out the rail and change them.
The set of 12 pieces seems like it is the valve cover bolt grommets. No where else that would apply. Can't tell by the picture.
The two larger o-rings, if they are the same size, are for the water pump pipe that goes from the pump to water neck. The only places where there are O-rings(and matches the sizes you have in the picture) on the 1JZ are:
Two for the water pump pipe
One between block and upper oil pan
One between Water pump and block
Two for the oil pump
Two for each injector inside the rail(pull injector)
The three silver circles are washers.