Build some fills in 4/4 by orchestrating different groupings of sixteenth notes.
Using various different combinations of sixteenth note grouping to create full bar fills
2 beat fills within a bar of 4/4 that use a specific combination of 16th groupings.
Some simple half bar fills built from one repeated rhythm.
Some simple one beat fills built from a mixture of eighth and sixteenth notes.
Create some interesting patterns with this idea for appling sixteenth note groupings to an odd lengthed fill.
Creating more interested rhythms in half bar fills by orchestrating sixteenth note groupings.