Okay time for a little update I guess. I'll be changing the rules just a bit.
You can now come up with your own designs. As long as they relate enough to our "theme" so to speak we'll consider them. You can also include the name of our business, which is GrassRoots Yard Care. We won't be choosing any "logos" that are just text with some effects applied, I can do that myself. We'll be printing these in full color, never black and white. The colors we'll be using on our flyers/business cards/signs/whatever else will be only green and white, with black text - no complicated backgrounds or anything, so the logo CAN have a background but Jay is right that it might be nice without one.
Also, vector graphics are preferred so we can print these in any size we want. If you're not able to do that, make it very high resolution. 1000x1000, 1500x1500, basically just as big as you can so we're never limited by resolution.
The prize should be awarded fairly soon after the deadline, but you might have to wait a few days. It'll come, though.