Plant for making decorations on a bituminous membrane including a feed device configured to feed the bituminous membrane at a determinate speed in a direction, and at least two depositing apparatuses disposed one in series with the other in the direction and configured to deposit solid particles on the bituminous membrane according to respective patterns in order to obtain respective decorations on the bituminous membrane. The depositing apparatuses each includes a transfer member configured to receive, support and transfer the solid particles from a respective feed device, to the surface to be enhanced of the bituminous membrane.