Well, seeing as NAVAIR is one of my thangs, I have a hard time answering this one and sticking to only one choice. However, as a rule, I generally don't point out the usual suspects. (Toms of VF-84, 111 etc...) I usually go for something a bit more off the beaten path than most. Nonetheless, I'm rather surprised that none of the following have yet been mentioned.
I really like the look of VF-92 Phantoms from the late 60's early 70's. (I mean the later Spade emblem, not the Chess Piece.) And VF-32 had rather attractive markings on their Phantoms during this period, as well.
The list of all-time classics would be incomplete without these rather gaudy candidates: Flamed Crusaders of VF-84, and the Eagle-adorned Phantoms of VF-51. These birds are legendary amongst fans of NAVAIR.
Variously, some other "not-so-flashy" faves of mine but very colorful and smart looking, nonetheless, would be Phantoms of VF-201 & VF-202. VF-171 Phantoms (Previously owned by VF-101 and still wearing bicentennial markings in '77) are really nice looking jets. Tomcats: VF-2, VF-21, early VF-33 & VF-302.
If I had to pick my fave, it would be a most unlikely suspect. Rather plain-jane, but with a splash of color and exhibitng simplicity in the extreme; VF-191 Tomcats. Fitron 191 was in the middle of converting to the Tom in the early 90's when budget cuts saw the unit disestablished, along with it's sister-squadron VF-194.
Fade to Black...