Blending textures while using tile textures

TL;DR version: Anybody have a link to a site explaining how to blend textures while using tile texture and uvmap using code at runtime?

Have an object I am creating/uv mapping within unity. Currently just using a diffuse shader for it.

Currently tile 0,0 covers the whole object and on action I change the location of action to tile 0,1 and need to blend the surrounding polys to a blend of both tiles basically setting the alpha to a gradient toward the origin

I am sure I will need to clarify this but pretty much I need to do this: http://wiki.unity3d.com/index.php?title=Blend_2_Textures

but while preferably using standard diffuse shader and tiled textures

I have tried looking up the answer but I either find exactly whats on that wiki or links to how to do it within blender

Because it doesn't feel right asking for coding help without some sort of code

         //create verts then calls class that runs:
         //tileMod = .03125 (32px on 1024 sheet) bx/by= counters to cycle through cutting a 128x128 sheet up
         //zero.x/y = 0.0 - 1.0 origin of block i am currently working on.. lod = level of detail = 2 for these purposes
         _t[0] = new Vector2 (zero.x + (tileMod * bx),                                 zero.y + (tileMod*by)+(tileMod*(2f/lod)));
         _t[1] = new Vector2 (zero.x + (tileMod * bx)+(tileMod*(2f/lod)),            zero.y + (tileMod*by)+(tileMod*(2f/lod)));
         _t[2] = new Vector2 (zero.x + (tileMod * bx)+(tileMod*(2f/lod)),            zero.y + (tileMod*by));
         _t[3] = new Vector2 (zero.x + (tileMod * bx),                                 zero.y + (tileMod*by));
         //returns _t 
         foreach(Vector2 _a in _t){
             unModUV.Add(_a);
         }
         mesh.vertices = unModVerts.ToArray();
         mesh.uv = unModUV.ToArray();
         mesh.triangles = unModTris.ToArray();

Do not know how helpful that will be but its currently how I apply the texture/uvmap.