Wow, thanks for the compliment Dux. The F4F/FM-2 skins are the most detailed and least buggy of all the ones I've worked on.
The Seafire with the contra rotating prop is a Griffon engined Mk 47. This mark was too late to make WW2 though, so it wouldn't be accepted into the game. Basically any FAA aircraft with that scheme is post war.
The Seafire with the 7B code is from 800 Squadron, flying from HMS Indomitable and HMS Argus circa 42 or 43. This one would be accepted no problem, however Kev's already done a very similar one.
If you want to look for Navy schemes this is a good place to start.
http://modelingmadness.com/decals/decalsf2.htmMost of the Navy planes have a lot of mirroring or patch bug issues though, particularly the F4Us. So if you find a really nice scheme that hasn't been done, there is usually a reason.