I Was wondering if there is still a possibility of puting it on there.
Probably not... however there is a freeware proggie called Desktop Architect which was written for 98 and replaces boot/startup screens, icons, cursors, taskbar and window frames, etc. It should do what you want and more,
Available here...
WWW Link at PC World. You can also find themes and boot/startup screens there at PC World also. There are also theme sites, like the Penniless Prophet, but be careful of the executable files they are packaged in, as they can sometimes contain additional, unwanted files.
Hope this helps/is of use to you.