I don't even like coffee, but I saw this and thought I might try it for the hubby:
Iced Coffee “Gumdrops”
Makes two dozen 1-inch cubes
4 cups coffee
1/2 to 3/4 cup sugar (depending on your desired level of sweetness)
2 envelopes unflavored gelatin
In a small saucepan, bring the coffee to a boil. Once it is simmering, whisk in the sugar and gelatin. Stir until they are completely dissolved. Turn off heat and let sit for 5 minutes. Pour the coffee mixture in a shallow pan. Refrigerate for 3 hours or until firm.
These are apparently very strong unless you eat them with some whipped cream or something similar.