Measurement conversion chart and labeled measuring cup holder for your cabinets doors. (I did this and every time I opened the cabinet, the cups would SMACK the door loudly. It would do better just in a cabinet and not on the door.
Sharpie + Dollar Store mugs + Bake at 350 for 30 mins = easiest personalization ever. You can even use super cheap mugs from the dollar store to create gifts or party favors. Just draw on the surface of your mug and bake it for 30 minutes at 350 degrees.