Had several trees cut down on a hill in my back yard.

http://homeguides.sfgate.com/home-remedies-kill-tree-stump-84530.html

The easiest and most efficient method is hire someone to grind the stumps.

Its very intense manual laboring -to wack it out with sledgehammer, wedge, maul and or mattock. If its rotted it should be much easier than a new sizable stump.

We tried drilling out hole perforations applied the commercial chemical applications of stump out and burning that failed on a large willow stump and with failure resorted to contracting the professional stump grinder service.

On smaller cedar stumps we leave them for a matter of time and hack away with sledge hammer maul wedges till it breaks up. I did recently see they do rent out two different sized hp -stump grinders at my local Home Depot Tool rental

You can drill the stumps and put in chemicals to rot them out. OR decorate the stumps with flower pots, any kind of yard art. I have been working on mine for months but I am to old for hard work...LOL

And I am fighting first wet chilly weather and now rain and sauna weather...can't take much of that heat at a time!

Can you make a garden around the stumps? Perhaps with some rocks or landscaping blocks. You can use the stumps to set pots of flowers on and plant perennials around the stumps.

Have youo considered a fairy garden? They are creative and can be very beautiful.

Lowes- but a can of truck rot

If they were mine, I’d cut them various heights (for interest) THEN plant Cotoneaster. It is a tough, fast and low-growing ground cover. Get the one that grows really flat with red berries. It’s beautiful yet tough. It will climb over your stumps and around them. I’d also place a few good sized landscape rocks and let the Cotoneaster trail around them. Your stumps and garden could look really classy and beautiful.

sorry for the spelling, I meant buying a can of trunk root