OK, after some serious searching, I found an O2 Splash I built from back in my early Tilt days. I converted the original 240x320 .bmp to a 480x640 .bmp. Then ran the patchsplash.exe file to create a fully functional .nb file prior to building the .nbh file. I hope this is what you guys are looking for. If not, drop me a PM and I will see if I can find the exact file.
Included in the .zip file is the .bmp and the .nbh file. I have not included the ruu wrapper as I find it much safer and quicker to flash via SD card. Just rename the O2Splash.nbh to RAPHIMG.nbh and drop in your root directory of the SD card and enter bootloader.
I have also attached the .bmp file by itself in case it is not correct and you dont want to flash the .nbh file.