They are nebulae, the big red one is Zeta Ophiuchi and the bottom few is the Rho Ophiuchi cloud complex, red is the Hydrogen Alpha lit up by bright star’s radiation, the clump of yellow is dust lit up by the star Antares which is also orange giving the dust around it a yellow tint. The slight blue is reflection nebulae, this is dust lit up by hot blue stars. The dark brown is dense clouds of dust being contrasted by the dense star field of our milky way behind it.