Like the SCAR and FY71, green and light yellow? However in the original crysis(Original/1) they looked so cool and realistic!
Then the rocket launcher from Warhead has a bit un-distinctive writing of "Highly explosive warhead" on the side while the original one just a had a bar code.
(Though the writing did seem cool and devilishly tempting)
If only they made these designs/decals an option, then if you want that realistic feeling of playing with up-to-date weapons. Its possible
I myself, only prefer playing with those decals when in Multiplayer to kick ass!! and make my friends look more bloody.