Thanks for the comments everyone.
Here's a few more I have access to at the moment:
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Flow on the rootless shields below Pu`u O`o, Kilauea
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Pahoehoe flow below Pali Uli, Kilauea, 2001
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Looking out through the Puka Nui gap in the wall of Pu`u O`o Crater, January 2004
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Photographer G. Brad Lewis on the rim on Pu`u O`o Crater
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The collapsed roof of a lava tube
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View into the crater of Pu`u O`o at Dawn
In terms of access, I used to work at the US Geological Survey's Hawaiian Volcano Observatory, and a few of these pictures were taken on research and work trips in places accessible only by helicopter and generally off-limits to the public. Some, however, were taken at various open places around Volcanoes National Park, a short hike from the end of the Chain of Craters Road / Puna side depending on the flows. At certain times in the past decades, the lava flows have been very easily accessible.