Just a tiny word of caution with IGLO. It is an old script that goes back to Gimp 2.2 although the latest version from 2009 changelog fixes some gimp 2.6 bugs.
If you search back, (usenet? comp.graphics.apps.gimp?) there were the occasional reports of multi-layer .xcf images made with IGLO being corrupt. From memory (getting old, none-too-reliable) this was about images made in gimp 2.4 and failing in Gimp 2.6
If you use common sense and keep the source images safe, I think there is no problem with Gimp 2.8. Just be careful.
Still not the easiest script to use.
Looks like the web site is gone at the moment, I get a gigaserver web-hosting message displayed here.
Still there, if you go to the internet archive.
http://web.archive.org/web/201210090154 ... oboda.biz/