Know what would be cool ? Jello made with Colloidal Silver . I think you'd have to make the recipe with less than the required amount of water up to the boiling step b/c boiling destroys the colloid. Then, once it had cooled to room temp, make up the missing volume using CS suspension.
extra efficacy ? I don't know, just seemed like a cool idea. But it could be a good way for long-term storage of the colloid, some concentration being lost due to the dilution however.