I’d start with a seed—pick a flower that mirrors the area's core mood, then let its petals, colors, and even its growth pattern echo hidden truths. For example, a valley of lotus could hint at rebirth if the water is calm but the surrounding cliffs show cracks—tiny silhouettes of hidden doors. Use color gradients to suggest emotion: a field of pale roses that slowly darken as a player approaches a secret cave, signaling warning. Tiny motifs on stone—like a single thistle seed—could be a breadcrumb to a forgotten lore. Keep the symbols quiet; let them appear only when the player looks closely or uses a special tool. That way, the world feels alive and thoughtful, and those who pause long enough will notice the quiet conversation between nature and narrative.

That glow will feel like a secret whisper—just enough to tickle the curiosity without shouting it out. It’s a neat way to keep the world breathing and the story humming under the surface. Good luck turning that valley into a living poem.