I heard of someone whose rellies scattered them on a cornfield. The following year they went back and picked some of the corn and made a flower arrangement sort of thing...
My grandad died last month. The undertakers will keep his ashes until we are ready to scatter him (which will be after my granny goes, so that they can be together). It'll be somewhere they liked to go for a walk, but ought I to ask the landowners permission?
My cat also went last month. His ashes are in a box on my oh's desk. We are going to buy a very large pot and plant a rose on top of him (mobile, in case we ever move).
Personally, I don't care what happens to me, whatever makes those I've left behind happier. I've seen a few rellies scattered in gardens of rembrance, but I find that really depressing and was glad Grandad didn't leave instructions about his ashes, although he had organised and paid for his funeral.