yes I have a gravel garden, but it's very small but I read one of Mrs Chatto's books once and got some ideas from that. She modelled her garden to appear like a dried up river bed with the gravel paths running through it, if I recall and I like that look very much.
My gravel bed was first of all cultivated and enriched with top soil then covered with a thick weed suppressant membrane [one which allows water to drain through] and then a thick layer [a good 2 inches] of large-ish gravel stones laid on top. My small borders [ quite narrow] are edged out around it and I like to plant within the gravel area where I remove some of the gravel and cut away some membrane to plant something then replace the gravel. That way I have a more informal look. It's a work in progress and is fairly new. It's very small and manageable for an older person.