It is not a masterpiece of art but maybe it will help you a bit.
Test1-file is a blueprint (dont unzip, just put in the blueprint folder) for a 45 degree shaped block, as you requested. In the same texture as you mentioned above.
With some more patience it could be better but it is just to proof that it doesn´t take long (less than 5 min) to create such a block on your own and blueprint it for future use. I still agree regular shapes like this would be easier and i look very much forward to it. But until then we can find our own solutions.
If you don´t like this one have a look at this picture. I simply used 2 blockwalls and at the corner i added a round beam (log) that filled the corner. Looks much better than my blueprint and is much faster to produce. Downside is that it is also visible on the inside of your wall. That can be helped though if you just make your buildings a bit wider and cover the inside of the walls either with planks/beams (like a wallpaper) or with a 2nd row of blocks.