A dark cosmic background with neon-outlined 3D geometric shapes floating in space, each containing a small galaxy.

Create a phone-sized wallpaper showing a matrix of various 3D geometric shapes, such as cubes, pyramids, spheres, and tetrahedrons. Inside each shape, depict small, detailed universes with galaxies, stars, and nebulae, creating a surreal and cosmic effect. The shapes should be outlined with neon-colored borders like blue, orange, yellow, etc., making them stand out from the dark background. The background should be dark with hints of glowing light and vibrant colors coming from the universes inside the shapes. The geometric shapes should appear as if they are floating in space, adding to the mystical and infinite feel of the design. The overall aesthetic should be futuristic, dreamlike, and illuminated by the neon outlines See more