Design of porous materials at various length-scales is the subject of scientific interest for more than twenty years and has induced important applications in environmental and green technologies. Among the compositions available as porous components, inorganic compounds in form of hierarchically structured porous materials hold a strategic position in fundamental and applied researches. Many systems are based on porous oxides and in particular on silica. However, the monolith’s final mechanical robustness, thermal conductivity, high-temperature stability as well as chemical inertness and functionality are usually required properties so the as-synthesized porous materials can be directly integrated into a device set-up. Taking into account such properties, oxide-type materials do not always cover the current technological needs. To address the issue of more functional porous inorganic materials, alternative compositions such as non-oxide should be therefore explored. Here, we report the synthesis and characterization of a series of SiBC, SiAlCN and SiBCN foams used as matrices for the in-situ growth of TiO2 in order to offer functionalities to the foams. Characterization is done at different length scales.