The Fungus Cave is a bit of a specialized setting. I'm not sure I'd want to use too many of these tiles -- splashing a few into an ordinary cave is probably better than creating an entire fungus-filled cavern.
That said, as usual, e-Adventure tiles are a miniatures game staple around here, allowing for very rapid creation of intricate battlefields. They're pricey (well, not this set, but the others) but VERY worth it.
As noted, this set is a bit more specialized, but (1) it's free and (2) you know what you're getting from the cover, so if you don't have a use for this set in particular there are plenty of others to choose from.