bulk photo editor

Question

Is there an application that would allow me to just drug in a bunch of icons and change the color of those icons to pure gray.I really want to make my desktop look like this: http://www.howtogeek.com/news/this-customized-windows-desktop-has-impressive-icons/190/ but I need to customize all of the icons so that there is harmony in color. As much as possible I do not want to use photoshop for this

Answer 1

How about Irfanview's batch mode?

http://gd.tuwien.ac.at/graphics/irfantut/imagmenu.html#conve

Answer 2

How about ImageMagick? That can perform bulk operations either from a command line/batch file, or with a scripting language like perl or vbscript.