Cellulose nanofibrils (CNFs) and lignin nanoparticles (LNPs) have emerged as sustainable emulsifiers for Pickering emulsions due to their favorable properties like renewability, low toxicity, amphiphilicity and biocompatibility. In most studies they have been used separately but their combination offers unique advantages not achievable with only one of the components. The spherical and amphiphilic LNPs assemble around oil droplets in oil in water emulsions decreasing the surface tension and introducing steric stabilization, while the CNFs increase the viscosity of the aqueous phase, further stabilizing the emulsion. Hydrophobic polymers that are not miscible with water can be incorporated in the oil phase and upon drying the LNPs act as compatibilized between the polymer and hydrophilic cellulose enabling production of strong, water-resistant bio-based composites (1). Using broad band dielectric spectroscopy, we show how the lignin affects the interactions between components in the dry the composite (2). We used a similar emulsion templating strategy to fabricate strong, binder-free, cellulose-based foams using LNPs, microcrystalline cellulose (MFC), and a biodegradable polymer. CNF-based foams have a tendency to shrink or collapse during drying due to the capillary forces at the hydrophilic CNF surfaces. Hence freeze drying, supercritical drying or chemical crosslinking are in general needed to produce stable foams. Herein the foam was produced at room-temperature, using volatile hydrocarbons as the dispersed phase, avoiding energy intensive drying methods. By optimizing the ratio of cellulosic fibrils and the oil phase composition, we achieved tunable foam properties including low density, high porosity, low thermal conductivity, and robust mechanical stability. Some fundamental aspects of both CNF and LNP properties for emulsion and foam stability will be discussed. Our findings establish a versatile platform for developing sustainable, high-performance biobased composites and foams while maintaining biodegradability.