Unipolar stepper motor with ULN2003?

[Robin Hewitt]

So you driving pairs of coils, one forwards, the other backwards or both off? Curious configuration. Where's Irving? He explains these things much better than I do.

The individual darlingtons can sink half an Amp. You could double them up to get 1 Amp but the duty cycle won't be anything to write home about unless you have big coil impedance.