This is caused by the High Quality graphics engine, and it can be resolved either by reentering character creation a few times until the problem disappears (don't panic if you see bleeding colours, your GPU is not dying!) or changing to default graphics and then back once you have created your character.
Be aware that using the high quality graphics engine you will also get similar flickers in certain areas of the game itself, especially those where multiple layers of ground and geodata are present at the same time (like for example the ruined land in Sarpan with the caves beneath it or the Strigik forest in Sarpan)