I agree with Emote on the matter of meshing, in addition to that, just from a conceptional standpoint the pebble blocks are supposed to be loose pebbles like those you'd find on beaches, in river beds or else where naturally. If I recall correctly the streets of OT are canonically cobbled, which means they are properly set with some sort of binder, not just some loose pebbles spread around. I'm humbled that you've taken to using them for the OT streets, but if you think they look like they belong there then I haven't done my job correctly and will have to change the textures which are still a huge WIP btw.
I have a bit of a gripe with using the river cobble, cobblestone and small brick block as floor textures simply because they are made in a specific way. When you look at a single tile, you'll see that the objects depicted on them are highlighted from the top with shadows towards the bottom. This is because they are intended for the use in a wall with light shining down from the sky. A road texture should be shaded quite differently and with that in mind I think you can be forgiven for taking a look at the pebble textures as on them the lighting is more diffuse. However, the block is extremely noisy (lots of small pebbles lying at different elevations), which again was meant to signifiy that it is a more of a natural texture.
In addition to that, the cobblestone texture is quite extreme as it has a strong contrast in itself. That can work for a wall but for a road you'd want a more homogeneous look that blends seamlessly and inconspicuously. I think there is a reason why the dark cobble stormlands block is so popular as a floor block.
Just in terms of finding the right amount of shading and 'human'-influenced order I quite like the look of the northern cobble turned reachy. To me the spacing between the individual cobbles also seems 'right', for humans to have laid them down, and the block is dark enough to 'ground' the extremely light buildings around it. If the highlights on it were made a tad more diffuse and you'd introduce tonal differences for the individual cobblestones on it, I think that could be a great main block for OT streets. It may even be dark enough to work with dirt or gravel. As a complementary block texture wise I'd look towards the dark cobble block which is very flatly shaded i.e. another great floor block.