I saw a documentary about this once. It showed many different things you can do with your loved ones remains. For instance, it did talk about the diamonds and the process. There was a company that took the ashes, along with other people ashes, and imbedded it into a porous material that would be placed in the ocean where it would turn into a coral reef--perfect for someone that liked the marine world. You can also have your remains placed in a small capsule that would be sent off to space. They only could launch it into space once every year or two (it is sent up with a routine satellite and then released. There was even a ceremony on launch day that the loved ones would attend, it didn't seem morbid at all, it was very moving. Cremation is not for everyone, but I do think it offers some pretty unique ways to remember your loved ones.
I carry around my grandfather's chapstick, he was obssesed with it and used it on his knuckles as a lotion. He used it at least once an hour, and was even buried with a tube in his hands!! I pull it out and smell it when I want to think of him. It's weird, but it means a lot to me.