I asked FooFighters if it would be ok and he said it was so here goes. I use Trigger Maru Overhauled (v1.4 of the game) with the RSRD campaign files. I really like his high res skins. I don't know if I could ever go back to using the stock skins.

I also liked how the game gave you black skins at the start and then gray ones later. What I did was rearrange FooFighters' awesome skins so that the game will give you a high res black skin and then a high res gray skin at the right time. The Tench also has a high res skin. I read that it was based on the Balao, so I renamed a high res Balao skin to work with the Tench. I don't see any ill-effects. These are just my favorite skins of his included. I had done this initially for just myself but thought others may want it. Stupid me forgot to put a readme in the file, but I don't think it really needs one, just place it in the JSGME Mods folder and activate.
http://files.filefront.com/FooFighte.../fileinfo.html
Here's the thread where all his skins can be found.
http://www.subsim.com/radioroom/showthread.php?t=113835