  We present 154 MHz Murchison Widefield Array imaging observations and
variability information for a sample of pulsars. Over the declination range
$-80^{\circ} < {\delta} < 10^{\circ}$ we detect 17 known pulsars with mean flux
density greater than 0.3 Jy. We explore the variability properties of this
sample on timescales of minutes to years. For three of these pulsars, PSR
J0953+0755, PSR J0437-4715 and PSR J0630-2834 we observe interstellar
scintillation and variability on timescales of greater than 2 minutes. One
further pulsar, PSR J0034-0721, showed significant variability, the physical
origins of which are difficult to determine. The dynamic spectra for PSR
J0953+0755 and PSR J0437-4715 show discrete time and frequency structure
consistent with diffractive interstellar scintillation and we present the
scintillation bandwidth and timescales from these observations. The remaining
pulsars within our sample were statistically non-variable. We also explore the
spectral properties of this sample and find spectral curvature in pulsars PSR
J0835-4510, PSR J1752-2806 and PSR J0437-4715.
