Thanks Flyenemu.

Here is an update. I think I'll release them as a package of jpeg files, with & without grid; Starting Area's, Chambers and Passages. I'll also include a small-ish PDF document with suggestions for use etc.

I'm open for suggestions on what people would prefer for single doorways; the hinge on a grid line, or the gridline centred on the opening?

Here is the first entry and passage tiles:
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