tmz - I found another program that I had referenced a while back from an XDA thread. This one is real simple, and it's free. Hopefully it will work for you.
http://www.becyhome.de/becyicongrabb...iption_eng.htm
In order to create a .dll file you need to choose multiple .ico files. Once you load the .ico files into the directory press and hold the shift key and select the .ico files you want. The selected files should appear in the opposite window. Then choose the icon size you want with tabs on top. Then hold the shift key and select all the files. You should then be able to save them as a .dll file.