This is something that can be done, alone, on a walk in the countryside, with no extra magical 'tools' or paraphernalia. It is simple magic and down to earth paganism. It can be applied for any need, but is particularly suitable for 'earthy' needs, such as money, housing, jobs, healing.
Take one stone, and speak (or 'think') into it your need. Place the stone firmly on the ground. Take another and repeat, until you have a fair sized mound, or Cairn. As each stone is placed, imagine that the magic is building and that your need is getting nearer to being met. If you have no stones, you can still do this with imaginary stones, or pebbles, or whatever else seems right at the particular moment.