Do you have a solution to fix/hide kitchen tile mistakes?

We just had an inexperienced contractor lay porcelain tiles on our kitchen floor and he made some major mistakes that we have to live with. There are some hairline cracks to fix as well he did not cut the tiles around the door trim and cabinet toekicks correctly.
The tiles were cut too short and now we have huge gaps that cannot be filled by caulking. What do you suggest? He used up all of our tiles and the tiles are discontinued.
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