  We study the flocking and pattern formations of active particles with a
Vicsek-like model that includes a configuration dependent noise term. In
particular, we couple the strength of the noise with both the local density and
orientation of neighboring particles. Our results show that such a
configuration dependent noise can lead to the appearance of large-scale ordered
and disordered patterns, without the need for any complex alignment
interactions. In particular, we obtain an ordered band or line state and a
disordered active cluster, similar to that seen in the case of motility induced
phase separation.
