pjeterschornstein

Thanks Rockhopper, I sure like to do a one of a kind ones. I'll try a few from start to finish and do tests. If it would be too much work I might also do only a few to place i between commercial ones.

But for the walls it shouldn't be a problem right? It's actually a house that I'm renting out for part of the year. I don't want to have problems while I'm not here..

Thank you all for all the comments.  I will ask in the local workshop in general but you really got me convinced to aim for wall tiles and let go of the floor tiles.
I think it's a big undertaking even without adding more difficulties I'll post a pic if I do it and I might have a few questions along the way. Thanks again!