To get it to tile the easiest way is to just scale up the face in the UV editor window. The face doesn't need to lie within the image boundaries. If it doesn't the map will tile.
1. Select face
2. Move mouse over UV/Image editor window
3. S to scale.
Or as Jeremy says you could scale the texture within Blitz.
1. Select face
2. Move mouse over UV/Image editor window
3. S to scale.
Or as Jeremy says you could scale the texture within Blitz.