Customers often want to set the background color of analytic visualizations such as the ProClarity charts & grids, to match a corporate or dashboard theme. Unlike the ProClarity charts & grids, it's not possible to set the background color of the heat map visualization within ProClarity Professional... it's always a cream color... but it can be changed through a simple modification to the PAS server CSS files.
The color is defined per-language in <PAS virtual directory>/<PAS language>/src/treeview.css:
body { height: 100%; margin: 0px 0px 0px 0px; padding: 0px 0px 0px 0px; width: 100%; background-color: #ece9d8; }
Feel free to change it for each language pack. Although it's unlikely a PAS service pack or hotfix would update this file, you may have to re-apply the changes after installing a SP or hotfix.
The downside to all of this is it's a global change, affecting all heat maps rendered by the PAS server. I have visions of using URL-rewrite to make this dynamic per heat map instance, but unless someone wants to make my vision reality, that's all it is for the moment.