The same photos and text in every version; only the gradient and texture over the photos change. The first one is what's on the site now, for comparison.
What's on the site at the moment.
The teal glow with a fine paper grain over the whole hero, like the texture on rohininilekaniphilanthropies.org. Subtle: it reads as a surface rather than a pattern.
The teal glow with a coarser handmade-paper texture: grain plus faint fibres. Closer to a printed, crafted feel.
No texture at all: a smooth deep-navy-to-teal gradient behind the text, fading out over the photos. The simplest and calmest.
A soft pool of teal light behind the headline and a faint sky-blue glow in the top right, so the dark side feels lit rather than flat.
The faint grid from the "About" section, carried into the hero behind the text and fading out before the photos. It ties the top of the page to the section below.
Thin map-like contour lines spreading from the bottom-left corner, a nod to field work on the ground. Fades out before the photos.
Faint rays of light fanning down from the top-right corner across the photos, like sunlight. The most dramatic option.