You need to install syslinux in case you haven't got it.
1. create a new splash.png file (using gimp or whatever)
2. convert it to "pnm" by using "pngtopnm" as in
Quote:
| pngtopnm splash.png > splash.pnm |
3. convert it to "rle" by using "ppmtolss16" as in
Quote:
| ppmtolss16 "#000000=0" "#ffffff=7" < splash.pnm > splash.rle |