New uses for ice cube trays

We all know the old fashioned ice cube trays -- which you may not use in your current fridge -- are great for things like making frozen cubes of pureed veggies for visiting grands. Or maybe for freezing leftover coffee or tea, to create frozen cubes for use in iced coffee and iced tea. This means no more diluted beverages.

But there are dozens of other ways you can recycle old ice cube trays.

What other ideas do you like?

I like the rainbow cubes.