Here are some Atlas and Walthers refrigerated containers I've been working on. The Chiquita decals are my artwork printed by PDC and applied to Atlas containers.
So far I've only weathered one container, but I used Tamiya panel line accent on the Walthers containers to bring out the detail, especially around the reefer unit in the front of the container. I only darkened the IBC receivers on the corners of the Atlas containers at this point, but I'll add some rust and scrapes along the corner posts going forward.
The clip-on gensets are my 3D drawing of a ThermoKing SG2000 3D printed, painted and decorated with another set of decals I had printed by PDC.
If you need custom decals, Bill at PDC is great to work with. I do all the artwork in Inkscape, which is a free vector art program, and set up the exported files according to Bill's instructions. The results are outstanding.