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Mille Fleurs should have a black bar running across the feather immediately preceding the white mottled tip. (sometimes referred to as a chevron)
In Tolbunts, you still have a white mottled tip, but instead of a black bar preceding the white tip, the feather is laced in black.
Calico is basically anthing that doesn't fall into the above. They originally came out of the Mille Fleur projects that were lacking the proper black bars, or had excessively large mottled tips. Mottling that runs farther up the feather than just on the tip is usually referred to as hysterical mottling. It is often seen in Seramas. Many have come to prefer the Calico coloring over the Mille Fleurs, but there is no written Standard for Calico plumage.
To further clarify the mottling gene, it actually does not create a white-pigmented tip. It is actually the exact opposite - it prevents the pigment of the feather from reaching the feather tip.