These are my last icon modification.
I used the original mybb install to get remaining icons.
I put all of these files in a single zip in attachment.
Notice that I've found additional "posts icons" that I've modified too.
I couldn't get good result with few icons , so it's not complete.
Ok here's are result with icon in root of "image" folder:
now in attachtypes subfolder
now in modcp subfolder
now in usercp subfolder
EDIT: for usercp icons, please use the ones in
usercp-modified.zip, some of them are missing "white dots" like :
trash_pmfolder.gif,sub_pmfolder.gif etc...
now in toplinks subfolder
and finally the extra bonus requested by LuisR14,
the "white ninja":