Razr I bootlogo
I fiddled around with the bootlogo.
There are the partitions mmcblk0p3 (ulogo) and 0p4 (logo). Format is RGB 24 bit, image data for both is 540x540 pixel starting at byte 536. You have to mirror the image horizontally to show it right.
Both logos seem to be signed. Exchanging ulogo for logo seems possible but sometimes gives an error, exchanging ulogo by modified ulogo gives "Service needed. Code corruped" image at boot. For me, this is a lot more convenient than the ugly BOOTLOADER UNLOCKED warning.
Disclaimer: I take no responsibility for any harm done by my above advice. You may permanently brick your phone by overwriting the wrong partition!
Please, people, all of you who do not know what they are doing here, DO NOT TRY.