Texture snow/ground blend

Which snow? Full (viaduct) or grass (barnblitz)?

All you really need to do is use gcfscape to extract the vmt for a blend texture that's close to what you want, and edit the basetexture variables. Blends have two of them, just swap the name of the texture you don't want for one you do want.

Then drop it in your tf/materials folder and you're good to go.