If the flagpole has a cement or stone base, use the base as a staging area for seasonally appropriate potted plants. A tiered base provides an even more interesting stage. Add a climber to dress up the pole, and connect it to the display. Mount brackets for hanging pots on the flagpole at varying heights.
A single climbing variety can use the pole as a support, but the addition of a few lines to the pole can convert it into a trellis. Connect lines of varying length to a point on the flagpole. Anchor the lines to the ground using a preselected pattern such as a pyramid, triangle or circle radiating from the pole. Plant climbing varieties at the anchor point of each of the lines, and train the growing plants up the lines.
Mount horizontal members at alternating positions on the flagpole. Add hooks, and use them to suspend bird feeders and birdhouses to help attract bug-eating avian life to the property. Use birdhouse entry sizes appropriate to the desired species. Lower bars can support dried ears of corn if you'd like to attract squirrels.
Many sports and games require a pole. Depending on the location of the flagpole in relation to existing structures, pick a sport to base around the pole. Use the flagpole to support one end of a badminton or volleyball net, with a conventional pole at the other end. Suspend a tether ball from the flagpole, or mount a basketball goal on the pole. Younger children may enjoy a piñata hung from a horizontal support or a target hung on the pole for magnetic or hook-and-loop dart game.
Add a nautical theme to the landscape by converting a flagpole into a ship's mast. Add a fixed horizontal boom, mast hoops to guide the sail up the pole and a horizontal gaff higher up the pole. Hoist the sail to provide shade to a porch or window when needed.
Hang seasonal or garden banners from horizontal supports mounted on the flagpole. Heraldic crests, state birds or wildlife or other decorative banners can reinforce a garden theme.
Place wind chimes on the supports to add melody.