We are solid re-users. Every time we take a trip somewhere, we try to buy an ornament from that place. This year we have ornaments from the Grand Canyon, Bearazona (bear preserve/theme park thing in AZ), Barcelona, Madrid, and Lisbon. It makes for a grand time decorating the tree because you get to think back to various memories.
The only things we buy are Lego holiday sets if they have one that we particularly like. This year’s is a train themed one, which we have decided not to buy because my husband built us a realistic looking MBTA green line trolley car a few years ago and that serves as our under the tree train. It works and everything! Sometimes the cat derails it, which is also like the real green line.