Silken tofu is pretty awesome, it's got great texture and a lot of protein. It will taste like whatever you want it to taste like. Use soft tofu for smoothies, and firm for dips and spreads.
Add 1 block silken soft tofu to a blender. Add 1 C orange juice and 1-2 tbsp orange juice concentrate. Add 2 tbsp sugar and 1 tsp vanilla extract. Blend until combined and add 4 ice cubes, then blend again until ice cubes are crushed. Pour and enjoy!