Decorative garden stones (larger than gravel) (Silsden BD20)

We have collected interesting stones from all over Europe and have them in our garden. Sadly many are now missing, and I suspect over the years our grandchildren have thrown them in the canal at the bottom of the garden. I've looked in garden centres, etc., and they have them, but usually in one dull colour. I'd be interested to know if anyone else has done what we've done, and has a collection they would now like to pass on.