Google is rolling out wallpaper-based theming for Gemini within the Google app, transitioning from hidden manual activation to a beta version accessible to users, including those on the Pixel 9 with version 17.27.33.sa.arm64. This update aligns Gemini with the Material You design philosophy, allowing the interface to dynamically adjust to the user's wallpaper colors, moving away from the previous static color scheme. Currently, changes are visible in Gemini's floating overlay UI, which adopts a tint reflecting the system theme, while the main interface has not yet fully implemented dynamic theming, indicating a phased rollout approach.