If you have a current cable that you want to convert to a crossover cable by cutting off one end and doing a recrimp, you can use the tool below to take the end you don't cut off and layout what the new end should look like.
This allows you to take any non-standard layout and know exactly what your crossover crimp should be.
If you are wondering 'How do you make a crossover cable?' Good news! This page defaults to a standard crossover cable. If you are wondering how to turn a regular cable into a crossover cable from a normal straight-thru cable, leave one end intact, coordinate the colors on the chart to that one end, and redo the other end to the crossover specification displayed for you.