Some options offered are:
Light / medium / heavy texturing of grip surfaces
Trigger guard under-cutting for both shooting hand and support hand
Trigger guard texturing, bottom, front and wrap
For STI types, lower grip screws can be removed and holes filled for a smooth finish
If you have a Department or Agency pin, it can be inserted into the grip
Back strap integration
Grip size reduction
Re-texturing of pre textured grips (see warranty note above, and on how to order tab)