This could be a start (and a shameless plug, I know

:
http://aminet.net/package/pix/icon/WB13IconsTwo small utilities to set your 1.3 Workbench to 8 colors, by editing a binary configuration file you can set the palette by yourself, plus a couple of converted NewIcons. I also remember an utility to display a 4 color wallpaper on the Workbench.
Varthall