Missing tiles?
 

Has anyone seen the deep lava (non-swimmable) tiles that fits with the rock to the right of the attached picture? There's a rock for the deep lava, but no deep lava...? :confused:

That's not deep lava, that's dark/shadow lava; the stuff you see around the cliffs -> lava transition. There is no tile for that though because the shadows weren't meant to stretch out from the shorelines.

They're meant to be used like this:
http://i.imgur.com/5EaUq.png

It wasn't until 2001 when pics1 got revamped that stand-alone water shadow tiles got added, however these transitions were never made for lava because it's a neglected(for good reason) portion of the tileset.

Ah...I see, thanks so much.

Disappointing though, would be useful right now...

You can make your own, via addtiledef2.