http://youtu.be/OI5-PByhj60
Here are the resources you need… There are tons of them:
Clockworks 1:
http://www.3planesoft.com/img/clock_screen01.jpg
Clockworks 2:
http://fc09.deviantart.net/fs46/f/2009/203/0/c/Infinite_Clockworks_by_Ratys.jpg
Script-Fu (Layerfx)
http://www.mediafire.com/?l2zmngqmrdx (Take the .scm file and copy it into your Gimp scripts folder.)
Video explaining how to install scripts:
http://www.youtube.com/watch?v=QxenERXuoQU
Grandfather Clock:
http://www.1-800-4clocks.com/miva/graphics/full/R2520.jpg
Grunge Texture:
http://i450.photobucket.com/albums/qq228/GimpKnowHow/Grunge_wallpaper_1-254502.jpg
Normal Clock: (The first 0)
http://lib.store.yahoo.net/lib/partshelf/45044Large.jpg
Screw:
http://www.sxc.hu/pic/l/c/ca/cactus13/301720_5987.jpg
I think thats everything…
Anyway, enjoy this time consuming tutorial. I hope you like the end result.