DANG! How can I make my A1200 screen look like that?
Patch to manipulate window borders and other GUI elements ->
http://aminet.net/package/util/wb/VisualPrefsPatch to allow colored icons ->
http://aminet.net/package/util/wb/NewIcons46Patch to allow lots of graphics without loosing too much chip-RAM ->
http://aminet.net/util/boot/fblit.lha (hopefully your accelerator has some fast-RAM, otherwise this is of no use)
More icons than you ever need ->
http://aminet.net/pix/niconBackground pictures and patterns ->
http://aminet.net/pix/backam I right in thinking I would have to reinstall my entire OS?
"Installing" in terms of AmigaOS just means copying some files from one place to another, so it's not such a big deal. But yes, you'll need to replace your boot partition with a new OS. Usually one just unpacks the distribution archive of the "preinstalled" Workbench to the boot partition. When it first starts it will ask for the installation disks and copy all needed files to the right places automatically.