I have installed the Header Cell Image MOD. It works for everything except for the PM MOD screens. Are there some tweaks I should look for in the PM MOD files to allow the gradient image I've made to show up on those screens?
I'd suspect so. I've not used the Header Cell Image MOD, but to get the PM MOD to look right for my SB2 forum I had to tweak the tables to add the CSS classes.
Having not used the Header Cell Image MOD, I couldn't say exactly. I'd be willing to bet your going to need to look for strHeadCellColor as an indication as to where all the table headers are and strCategoryCellColor for all the rows needing whatever modifications were needed for the category background (assuming that the MOD in question modifies it).