Ralph uses an airbrush. The software sort, rather than the hardware sort. It's much less messy.
Ralph takes a selection of your pictures, scans them if need be, and selects those that are most suited to use in a montage. Ralph then uses his airbrush, along with masks and clipping paths, to carefully merge those images into one.
If there's something not quite right with one of your pictures (an obsolete logo, for instance), Ralph can use his airbrush to make things better.
Ralph doesn't need a hairbrush.