Marble is done; this one was the easiest because the WinLemm version mostly looks great anyway, all I did was swap in the Amiga graphic for the pink "stuff" (the splodgy clumps of plasticine-looking stuff at the base of the level), and even that I'm not 100% sure is necessary. Let me know which you prefer:
Konbanwa Lemming-san with WinLemm graphics:
Konbanwa Lemming-san with "AmWin" hybrid graphics (only the pink stuff replaced):
Fire, on the other hand, was a fair bit more work to get right. I've replaced most of the terrain pieces with Amiga ones, and the steel pieces are the two blended together. I liked the more solid look of the WinLemm ones, but prefer the softer shading of the Amiga ones. Blending them achieves the best of both worlds. Here's
Triple Trouble with WinLemm graphics:
Triple Trouble with AmWin hybrid graphics:

And, to show the lettering, here's
Running Jump with WinLemm graphics:

And with AmWin hybrid graphics. The lettering used is WinLemm but with the shading dimmed slightly, to make it less "glossy plastic" looking. This way, it looks more like the Amiga lettering but with some of the extra shading and depth of the WinLemm version:

Finally,
Crystal is actually already a hybrid style even in WinLemm! Crystal is the only style to use original terrain, but with redesigned hi-res objects. All I did here was give the entrance hatch and exit a bit more detail, since I think that whoever did the WinLemm styles missed a trick in not doing so. Here's
POOR WEE CREATURES, with new entrance hatch and exit detail
(the blur in the centre of the graphic is where the centre of the level has been trimmed out, in order to get both objects in the same image):

I'm currently using these hybrid styles in my copy of SuperLemmini, but I'm happy to make NeoLemmix versions of them as well if people like them.
EDIT: I'll probably use some pieces from NeoLemmix's upscaler as well, since I particularly like how the large crystal pieces appear:
