Board List in sidebar (using ehportal)

[Aaron10]

This should be doable using SSI php but what I'm trying to achieve is rather complicated. I basically have a sidebar using ehportal (PHP block) where I want to display a list of categories and sub categories with board icons as well, so something like this:

[ ] Category 1
  [ ] Sub Category 1
  [ ] Sub Category 2
  [ ] Sub Category 3
  [ ] Sub Category 4
[ ] Category 2
  [ ] Sub Category 1
  [ ] Sub Category 2

(the [ ] representing the icon)

Currently I'm achieving this with a HTML block but if boards are rearranged, added etc. then it means manually updating the block too, so a PHP block would just do this automatically. Also I want to exclude specific boards (so include all but one or two specific boards for when/if I added new boards).