A High Internal Phase Emulsion foam formed by polymerizing a High Internal Phase Emulsion comprising: a) an oil phase comprising i) from 20% to 97% by weight of the oil phase of at least one substantially water-insoluble monofunctional alkyl acrylate or alkyl methacrylate, and ii) from 2% to 40% by weight of the oil phase of a substantially water-insoluble, polyfunctional crosslinking alkyl acrylate or methacrylate; iii) emulsifier; iv) cellulose nanoparticles; wherein the cellulose nanoparticles is at least one of Microfibrillated cellulose (MFC), Microcrystalline cellulose (MCC), Nanocrystalline cellulose (NCC), Nano cellulose or Nanocellulose or Bacterial nanocellulose, Nanofibrillated cellulose (NFC), Cellulose nanofiber(s), Cellulose microfibril or cellulosic microfibril(s), Cellulose nanorod or cellulosic nanorod(s), Cellulose nanocrystal(s) (CNC), or combinations thereof; wherein the cellulose nanoparticles are modified by a surface modification prior to insertion into the oil or aqueous phase to make the cellulose nanoparticles more hydrophobic; and b) an aqueous phase comprising from 0.2% to 40% by weight of the aqueous phase of a water-soluble electrolyte. a) an oil phase comprising i) from 20% to 97% by weight of the oil phase of at least one substantially water-insoluble monofunctional alkyl acrylate or alkyl methacrylate, and ii) from 2% to 40% by weight of the oil phase of a substantially water-insoluble, polyfunctional crosslinking alkyl acrylate or methacrylate; iii) emulsifier; iv) cellulose nanoparticles; wherein the cellulose nanoparticles is at least one of Microfibrillated cellulose (MFC), Microcrystalline cellulose (MCC), Nanocrystalline cellulose (NCC), Nano cellulose or Nanocellulose or Bacterial nanocellulose, Nanofibrillated cellulose (NFC), Cellulose nanofiber(s), Cellulose microfibril or cellulosic microfibril(s), Cellulose nanorod or cellulosic nanorod(s), Cellulose nanocrystal(s) (CNC), or combinations thereof; wherein the cellulose nanoparticles are modified by a surface modification prior to insertion into the oil or aqueous phase to make the cellulose nanoparticles more hydrophobic; and i) from 20% to 97% by weight of the oil phase of at least one substantially water-insoluble monofunctional alkyl acrylate or alkyl methacrylate, and ii) from 2% to 40% by weight of the oil phase of a substantially water-insoluble, polyfunctional crosslinking alkyl acrylate or methacrylate; iii) emulsifier; iv) cellulose nanoparticles; wherein the cellulose nanoparticles is at least one of Microfibrillated cellulose (MFC), Microcrystalline cellulose (MCC), Nanocrystalline cellulose (NCC), Nano cellulose or Nanocellulose or Bacterial nanocellulose, Nanofibrillated cellulose (NFC), Cellulose nanofiber(s), Cellulose microfibril or cellulosic microfibril(s), Cellulose nanorod or cellulosic nanorod(s), Cellulose nanocrystal(s) (CNC), or combinations thereof; wherein the cellulose nanoparticles are modified by a surface modification prior to insertion into the oil or aqueous phase to make the cellulose nanoparticles more hydrophobic; and b) an aqueous phase comprising from 0.2% to 40% by weight of the aqueous phase of a water-soluble electrolyte. <EOS>