Abstract: An imitation ornamental tree can be formed by clamping a split sleeve around an outdoor lamp post, and extending imitation tree branches outwardly from the sleeve. Each tree branch can incorporate multiple electrical lights and lead wiring for the lights. The sleeve can have built-in circuitry for connecting the lead wiring to the power supply for the outdoor lamp, such that the tree lights can be energized by the lamp power supply. The imitation ornamental tree transforms the conventional outdoor lamp into a lighted ornamental display during the Christmas season, or whenever it is desired to have an outdoor ornamental tree.