The formation of silver nanostructures with different crystals morphology in porous SiO2/p-Si templates by electroless wet-chemical method at temperatures between 20°C and 50°C and surface enhanced Raman scattering was investigated. It was found that optimized dendritic silver architectures contain a significant number of localized "hot spots". We show that well-reproducible silver nanostructures provide a significantly enhanced Raman signal of Nile blue dye molecules up to 10-6 M by using different excitation wavelengths (473, 532, and 633 nm). Based on our observations, the well-organized silver nanostructures can act as efficient surfaces for surface enhanced Raman spectroscopy as well as (bio)-sensor applications.