The Blank.ico is for those hard to handle application files and such. You will need a copy of Resource Hacker in order to open the executible files you are trying to blank out. In the opened .exe file you will generally be able to see the icon you wish to blank out. Here is where you replace it with the included Blank.ico file.
My personal opinion. I've never quite understood the obsession with using icons everywhere. I find them very distracting. To me, fonts are so much more a key ingredient to navigating an interface. It would be so nice if there was an options to just turn icons off in windows/other OS's. OK, ending rant.
Never used IconPackager but it's probably the safest start for changing icons. It'd be a great way to preview an icon theme idea just to see if the look works with the theme you're going for. I personally go straight for the dll's and reshack since I'm not a fan of applications that layer on top of the system (Most times they are a bit buggy/unstable). It's also much more thorough. Great post Neiio.
vistastylebuilder.com/forum/in… 1. Whatever theme you are using you can open the msstyles file in Reshacker and use "Find and Replace" to the font you like. I find it faster than using Stylebuilder (which most ppl might not have) to change each font individually. This will take care of a large majority of your fonts.
customize.org/blogs/uac%20mari… 2. The font substitution method can pretty much take care of whatever is left. I'd recommend backing up your system/registry if you want to use this method. One particular font I don't recommend changing is the "MS Shell Dlg"="Microsoft Sans Serif" portion. Changing that font causes issues in places like the color pallete changer, etc. It can be fixed in fontlab by utilizing the upm size of the original font but that's getting way more extensive than most would like.