Any example of colloidal solution where liquid Helium is solvent?
A solution implies that there are solvent-solute interactions. Helium is about the most chemically inert atom there is. In the case of water ice, the hydrogen bonding will be orders of magnitude stronger than the van der Waals forces, so colloids will not be stable at 'normal' pressures. I guess if I were looking for a colloid in He(liq), I'd look at N2 or perhaps H2. We've made a lot of progress since I had colloidal (surface) chemistry class, but I doubt that we could predict size of particles in any such system. But I don't know.