[Therion] changing wall line symbol

Hello everyone, this is my first mail, I just started to use Therion and I'm very excited about it. my question is about changing wall line symbology in the map. the wall line in all the map we made so far looks like this: [image: image.png] I was wandering if any one has done anything like this or similar symbol in Therion? -- Regards, Omri Gaster