You should be able to use the ATTRIBUTE(n) command to do this, where n refers to a specific attribute (foreground and background color definition) in the display palette. Palette attributes 1-4 are system-defined, and 5 thru 10 are user defined. Check the PROIV documentation for more on this topic.
Thanks. Right now it's just a handful of documents so I was trying HTML before looking to purchase third-party software. Most of our output will just be form letters that need to have our logo on them, so using HTML is not so bad. There's just one form that needs more sophisticated format that's proving difficult to render.