they are decorated with lights and ornaments
Usually just the Christmas tree. I've also seen wreaths and evergreen garlands that have been decorated with Christmas Ornaments. And I read a magazine that had pictures of tables that were decorated using Christmas ornaments.
The Christmas tree is a traditional Christmas decoration in Iceland. Most people have live trees in their homes. Trees are decorated with garland, lights, and ornaments.
The tree in the park is decorated with spherical ornaments, resembling balls.
That is the correct spelling of "Christmas decorations" (trees, lights, ornaments, wreaths, garlands, mistletoe).
lights, ornaments, presents, partridges.
Lights with planet and star ornaments.
tinsel and fairy lights
It depends on how you look at it. Ornaments are mainly to make a tree prettier, so if you can still make it pretty with only lights there is no point of ornaments. Try using different colored lights on it.
The Christmas tree was covered with scintillating lights and ornaments.
Lights Wreath Ornaments Mistletoe Stockings
I suppose that if you really felt the urge to, you could decorate a palm tree with little festive ornaments.