I like the no border version of flat white stones so much it was my first post on the forum and still my most popular contribution 
I still always use this theme to play on OGS
Related to the question of different sizes, I also experimented with an 8 bit style copying from Hayauchi Super Igo and never was quite satisfied with the result. That game has slightly different shapes for black and white along with different shadows, although to my eyes the result is still white stones look larger
