@RogerDatSoldier
There are two blimps ('blimp.yft' & 'blimp2.yft').
The texture files are here:
blimp.ytd:
...\Grand Theft Auto V\mods\x64e.rpf\levels\gta5\vehicles.rpf\blimp.ytd
blimp2.ytd:
...\Grand Theft Auto V\mods\x64w.rpf\dlcpacks\spupgrade\dlc.rpf\x64\levels\gta5\vehicles\upgradevehicles.rpf\blimp2.ytd
Note: I'm not sure if each blimp is capable of having multiple liveries but you can certainly edit/replace the existing texture/s in the two files I mention above