Grow a morning glory or trumpet vine on it.
Evergreen Jasmine vines leaves all year and reblooming flowers over late spring and summer. Or Virginia creeper beautiful colours in fall but lose their leaves in winter. There are many different cost vines
A few clematis vines would look beautiful after a few months....also, though it sounds crazy, painting it black or dark green could make it look very intentional and cared for.
Tie bamboo reed to it or add lattice for privacy.