Go into the IconPackager directory on your harddrive, sometimes the entire package will be in there as .ico's, you can use those in your dock. Otherwise what I've done is open IP, preview the package, copy the icons I want, open them into Axialis Iconworkshop and save them as png.

As for dock icons...if you go into the ObjectDock gallery, at the top under the header is a trail of breadcrumbs, the last one should say "All Categories," if you click on the arrow right to the left of it you should be able to select dock icons.