Showing that an item is interactable/can be picked up

Hey everyone,

I`m developing a point and click RPG (similar to neverwinter nights) and was wondering if anyone has any ideas on how to indicate that an object in the world can be used/picked up?

I have been considering:

• Changing the mouse pointer, but this is a mobile game so there is no mouse pointer.
  
• Having a outline around the object, sometimes can be missed as the color mixes in with the world color too much.
  
• Having the object shaded in a color,...

Showing that an item is interactable/can be picked up