This mod from ziher increases blood texture resolution and adds a splatter effect.
Resized vanilla decals with added splatter effect.
-check bInvalidateOlderFiles=1 in FALLOUT.INI
-check if Archiveinvalidation.txt is already in Fallout3 folder, if found edit and add lines:
-unpack to Fallout 3 folder without overwriting existing files.
-delete entries in Archiveinvalidation.txt that reference files listed above.
Edit this line in FALLOUT.ini to make decals stay for 20 minutes instead of default 10 seconds: