We have small gaps between the maple hardwood floor and the maple base, because the floor is not 100% evenly flat (it was not built very precisely in the early 1980's -- this is my big remodel now.)

Our painter already caulked the top of the base to fill in the gaps there (shown in the photos), but for the bottom of the base where it meets the floor, he could not find any caulk in our local stores that would match the color of the maple floor and maple base. A white or off-white caulk would stand out, and I'm told wood putty also would not work properly.

Does anyone know if there are companies or products with customized coloring for caulk (to match maple, for example) ?

Our other solution would be to add a thin maple "shoe" (?) strip along the entire flooring to cover up the gaps, but I'd prefer the cleaner look without the shoe, if there are other solutions like caulking. Thanks!