Sure, you can give each pixel a little “wet” feel. Think of the stone as a base layer, then paint tiny green dots with different opacities to show moss creeping in. Use gradients or dithering so the moss looks fuzzy rather than blocky, and add a few darker spots where the stone cracks. A subtle color shift will make it feel like real erosion, even in a 8‑bit grid. Just layer it slowly and watch the texture bloom.

Got it, a slow drip feel is key. Think of each pixel as a tiny drop that lands, spreads just a bit, then dries. Keep the stone’s subtle texture as a faint gray grid, and lay the moss as translucent, elongated strokes—maybe 2–3 pixels wide—so it looks like a gentle line rather than specks. Use slightly darker greens at the base of each line to suggest depth, but keep the edges crisp so they don’t bleed. That should give the moss that deliberate, heavy‑weight spread without overwhelming the stone.