You could stack the rocks up like a zen garden paint rocks paint pots
Look into Xeriscaping. Here are some excellent sites to peruse.
I am in the process of making a rock garden too. I am moving slow because the weather was so wet and chilly and then suddenly went to record breaking highs! At my age I can't move as fast as the weather changes!
But I am going to have a little of everything in mine...rocks, pots of plants, yard ornaments, an old concrete table, a concrete grinding wheel, etc. I don't even have everything gathered up yet.
The air is so bad we elderly have been advised not to get out in it. I hope to get on this the middle of next week when we are expecting better air!