This Liquib image illustrates how the Custom Sequons feature might be used.  A single Erupt Tool sequence was applied manually along a curving, twisting, overlapping path using the Burrow Action.  That sequence was saved as a Custom Sequon, which I named Pretzel.  The source image was Reverted and then the Pretzel Custom Sequon was applied 4 times.  A Tool Sequon (or Custom Sequon) can be applied at a particular position by clicking the mouse at that position while the CTRL key is pressed.  Sequon Options can often be used to influence the results of Sequons and Custom Sequons.  In this case, the Dual Colors Erupt Style was set with 4 different chosen color pairs.  The Fragment Shape was set to Round for the upper 2 Pretzels and to Brick for the lower 2.  The Orient Fragments by Angle option was set on for the upper-left and lower-right Pretzels and off for the other 2.  Custom Sequons can be extremely versatile, and might enable capabilities that would be quite impractical to perform manually.  Of course, once a Custom Sequon has been defined, it can later be applied on any image at any time.