Fanyam,

The "new" way to create skirting, or two-coloured walls, is to use the new Levels feature, available in the current 3.4 beta versions .

- Draw your wall(s) on Level 1.
- Create a new level and draw the same wall(s) again.
- Give the wall(s) on Level 1 and Level 2 a different colour or texture.

Read the info in the thread I pointed to, to learn more on how to use this feature, and to download examples.

Hans