See these proposals for O gauge Christmas track plans, suitable to be assembled around the Xmas tree and placed next to the wall or in some of the room corners. [>>>]
A nice German layout with Minitrix tracks that has a double main line together with a small branch track, giving many options for play. Size: 2600mm x 1300mm (102" x 51"); Complexity: medium. [>>>]
This is the presentation of “Port on the Canal” – Z-scale layout, created with SCARM by Detlev Stahl, using Marklin tracks in Z. Dimensions: 1750mm x 900mm (69" x 35.5"); Complexity: medium-to-hard. [>>>]