Im making a cake for my nans birthday in a week and need ideas on what to use for ice cubes. The cakes goning to be a chamagne bottle in a bucket with ice cubes in it. I thought about marshmallows but theyre not the right color and Jelly could melt any other ideas? I want the ice cubes to be clear sweets about the size of ice cubes maybe a bit bigger not smaller though.

You could possibly make hard candy (rock candy) in molds and use them for the ice cubes. If the humidity is high, they may stick together after they are placed on the cake, but should look great! Good Luck!

I think most people on here use clear gelatin. It is super easy and gives the best effect.

the rock candy works great - just toss w/ a little powdered sugar to keep from sticking. it will give a frosted look to the glass and you can use any clear flavoring you want. just pour out in a big sheet and break up after cooling for your ice chunks.

On a recent Food Network Challenge someone made "glass" tiles out of hard candy poured into a silicone ice cube tray. Wilton has a new silicone Brownie Bites pan that looks like little squares. I was thinking this would work great for ice cubes.

Besides the hard candy, I have heard of people using the unflavored gelatin (with less water) and cutting into squares when set...I'm not sure how that would hold up.

Even easier - there is a candy called Fox's Glacier Mints that is a clear square peppermint candy. I think they sell them at Amazon dotcom.
Just unwrap a pile of those for your ice!

Good luck