We perform a search for new Pulsar Wind Nebulae (PWNe) in the regions surrounding LAT-detected pulsars. To perform this analysis, we selected all LAT-detected pulsars from the second Fermi-LAT pulsar catalog and searched for emission in their off-peak regions using 3 years of observations. To do this, we developed a Bayesian-block algorithm for defining this off-peak region. In the off-peak regions, we performed a combined spectral and spatial analysis to determine if the emission is due to a pulsar wind, is magnetospheric in nature, or is undetermined. We will present a description of our analysis method and preliminary results.