Just in case anyone's interested here are a couple of icon alternatives. You need the original dds file installed as this only replaces the xml file. Credit goes to Arremis as this is his mod and all I did was select a different icon, from his icon file.
#1 Question Mark Icon (same as Help icon)
#2 Book Icon (same as Quest icon)
#3 Book Stack Icon (not currently used for anything else on start menu)
FYI: the white border is not apart of the icons as it's just to keep them seperated in the image.