Something I do to baking mix biscuits is to use buttermilk instead of regular milk. However, when time/laziness are factors, like early on Saturday morning and I really don't want to go to the store or I haven't had enough coffee, here's an easy shortcut to getting buttermilk. Add 1 tsp. white vinegar to a cup of milk and let it sit for five minutes before making biscuits with it.
Biscuits made with buttermilk seem to just be better - crispier crust and they rise better. I prefer light & fluffy biscuits to heavy ones. They seem to sop up butter & honey and gravy better.