I completed mine with salt, but I would definitely advice sugar as it's much finer and will look better on your nails.
Step by step break down after the jump.
So from the photo I guess you can tell I used a green textured polish, it was the only green polish I had. But as a result you cant see the salt on the top.
First step was just to paint each nail a different colour. For each polish I used 2 coats to get it the opaqueness I wanted.
I then cut up some fimo pieces into halves or chunks depending on the fruit, because when have you ever seen a tiny piece of lemon on the side of your glass?
I used artificial nail glue to stick them onto my nail and then added some nail art glue to the parts of the nail I wanted the salt to stick to. When the glue was clear I then added the salt.
The salt went on fairly easy I just need to lift some bigger chunks with my finger and press them on as they wouldn't stay on otherwise.
As much as I liked this design I didn't feel too comfortable having actual salt on my nails so I'm afraid to say it did come off pretty quickly after I did them.
The nail art glue I used was from Sparkly Nails, there's a link to them in my side bar. Sparkly Nails is a UK based nail art company that stocks many great priced nail art items.