Tee, I was at a Garden Show in Chicago, IL last year this time (it will be in a week or two again) and they were selling the drilled hole rocks (not as big as EH's mind you ...) and the pump and line and so forth for the disappearing bubbler! They were only $30 or something, could not believe how cheap they were! They sold them all included in a 5 gallon bucket, that had everything you needed, just dig a hole, bury the bucket, put the cone into the bucket for the water to drain back into, rock on top of the slotted lid of the bucket and fill the bucket with water. Amazing what people will invent! Those things were selling like hot cakes!
I, too, love to visualize possibilities of landscaping with ponds and rocks and mulch from other's pictures. Loved viewing them all. Thanks everyone.