Disney world does this! Lowes sells the 4 to 6" round PVC pipe with holes already drilled. Purchase an end cap, fill with rock, soil, and plant. I will often put these in the center of a very large pot to stabilize, and add amazing height and color to a container that has trailing plants (no end cap or rock needed if you are placing in a container)
Good idea for multiple reasons: 1) equisetum grows so quickly and make even the newest newbie of a gardener feel accomplished and happy, 2) equisetum can get out of control and this container will prevent that from happening, 3) creates privacy and covers up some unsightly areas
Cut strips of newspaper and 'glue' seeds at the correct distance apart using a mixture of flour and water. Once dry, plant directly in your garden and cover with soil and water. Great for small seeds like carrots and lettuce. Kids love it!