Any experience with quikrete walkmaker? Or other concrete molds?

I found that they looked a little cheesy. Whatever you use you want to make sure that you have a well leveled base. If you cut corners, you will just regret it in the end. I would opt for a sand base and some pavers or bricks. There are so many wonderful designs out now, they look much better than concrete, it's all doable by a DIY and will save you $$$.