Please feel free to contribute any images you can! Where possible measurements will also be listed. The only parameters I will set are that the stickers should have been available by themselves, so no bonus stickers out of soundtracks, or even MVS moves stickers, for example. If you're not sure, just ask me. Photos out of magazines are indeed acceptable (for you with the accessible NGF collection).
DISCLAIMER: These items are NOT for sale, this page is a museum, hence my accepting submissions.

NEO·GEO Stickers
(click for larger images)

NG logo stickers
 
 
 
Although impossible to tell from the photos, the largest NG logo stickers I ever had (which I believe are those in the first picture) actually had very slim machine cuts so the sticker could be peeled either as a whole, or each letter individually. I'm 99% sure the logo exists in more sizes than I still have pictures of (and I can confirm at least 4 sizes) so this needs your help to be complete. The right-hand photo in the first row is interesting since neither the paper nor the sticker seem to be totally smooth around the edge, or perhaps I'm just making too much of it. The first photo in the middle row is perhaps the same size as others but here is on square wax paper, which indicates a different distribution channel. I'm not entirely sure if the last photo in the middle row is actually a Neo CD logo sticker sheet or not. It seemed to be, it just wasn't completely clear.
 
Team Shinsuke stickers
 
Team Shinsuke stickers. Lovely, aren't they? For more on SNK's link to Team Shinsuke, click here.
 
Athena and Psycho Soldier stickers
 
 
The first Psycho Soldier sticker of Athena can apparently peel separately from the game logo itself, whereas it looks like one must personally cut out the SNK logo to apply it anywhere.
 
Fatal Fury stickers
 
Terry is from the Characters Sticker Set series which has I believe at least 7 entries, though I'm still trying to work out what they all were. The blue-topped stickers were from a series devoted to The King of Fighters '96 and Real Bout Fatal Fury Special. I'm not sure of the full extent of the series and only know of the Terry, Mai and poster art ones above.
 
Magical Drop stickers
 
Technically these don't belong here since they date back to the original Magical Drop. In any case, these are stickers for an organizer, with entries such as "birthday", "film", "shopping", "holiday" and so on. Sounds like Data East was aiming to attract teen girls with this one. Kawaii ne!
 
Samurai Shodown stickers
 
The SamuraiⅡ stickers can be peeled individually. Haohmaru is from the Characters Sticker Set series which has I believe at least 7 entries, though I'm still trying to work out what they all were. My feeling is that the Nakoruru sticker probably did not belong to the same series as Haohmaru, given the SSⅣ logo on it (note the absence of logos on the stickers from that series). The Ruru sisters sticker -illustrated by Aoi Nanase- is from G's Dengeki, a Japanese gaming magazine.
 
The King Of Fighters stickers
 
 
 
 
The blue-topped stickers in the top row were from a series devoted to The King of Fighters '96 and Real Bout Fatal Fury Special. I'm not sure of the full extent of the series and only know of the Iori Team and poster art ones above. The third sticker is here only to show that the plastic hooks seen in the first two photos were not universal, and in fact probably applied only to the stickers sold in some stores vs the mail order ones. Kyo is from the Characters Sticker Set series which has I believe at least 7 entries, though I'm still trying to work out what they all were. The sticker balls were unique to KOF '96 and had a retractable roll of character stickers. There were quite a few of these made for different teams. The '97 sticker isn't the first Neo item I have seen with no copyright stamp, and the '99 logo stickers are actually quite large. The KOF Maximum Impact stickers are medium in size.
 
Other NEO·GEO or SNK stickers
 
A variety entry from the Characters Sticker Set series which has I believe at least 7 entries, though I'm still trying to work out what they all were. The Money Idol Exchanger sticker is from the Super GameBoy port of the game and each character peels off as a separate sticker.