Toggle two different LEDs with one T Flip flop
You can do something like this assuming your flip-flop can source and sink the currents required by the LEDs and VCC is the same than the flip-flop.

You may also have to adjust the resistor values.







simulate this circuit &ndash; Schematic created using CircuitLab

This way whenever the flip-flop output goes high, the green LED turns on leaving the blue LED cathode at roughly the same potential than its anode and when the output goes low the situation is reversed.