I like Fuzzy's idea a lot.

We had our cat Pishi cremated as well, and her ashes spread out over a beautiful green grass field in the spring. It was really very nice since the trees were in full bloom and there were butterflies and flowers.
She was cremated in December 2000, and we simply kept in in a container in our safe.
I choose to do it this way because I liked that place and I knew that she would have loved to walk around there too. And it also looked like the Rainbow Bridge.