To start decorating or landscaping with rocks, you will need to make sure you know what you want to do with the rock and the design you are planning to make.
Then when you are placing the rocks, you will want them to look like they were there when you built your house in the yard they reside in.
The rocks will not look good if they are all the exact measurements and look like they were forced to be there. The rocks need to look natural to their habitat. After placing the rocks in the desired positions, you will need to dig at least 6 inches into the ground under the rocks and kind of bury the rock somewhat. As I said, the rocks need to look as natural as possible. Once you have placed your rock, if you have any against a wall or the house, you can use a soil mortar to make it look like plants such as perennial plants or something of the like growing from inside the wall or rock. You will also want to invest in a retainer wall to make this all look as natural as possible. That will make the wall also look like it was there before you built the area around it. I wish you the best of luck finding your “notch” decorating and landscaping with the tips of the rocks I have given you. Buy plants from a reputable online nursery.
Source of Information on Decorating with Rocks