Xeriscape Garden Under Construction - Part A

I decided a long time ago that our house will be surrounded with a supposedly beautiful xeriscape, which would help our household cut the costs in water and time. Currently we have nothing but rich dirt and weeds, but in time there will be something worth relaxing. Since I got a burst of energy (and time) today I started doing something fun for my yard and muscles. I heaved home a bunch of fist sized rocks from the field near my neighborhood. Now tell me if this is illegal so that I would stop, but for the meantime I'm having lots of fun and good cardio trudging along the brush, spotting rocks like an Easter egg hunt. The neighbors looked at me a little weird walking around with a rock-filled back pack, hunched over like a donkey, and wearing street clothes from our lastest morning adventure, but I don't care what the neighbors think until they call the police about a wacky Filipino woman rearranging the earth. What do you think?