Well, this applies most probably to gifts. Though the gifts you give to others might be small and insignificant, but it does remind others that they are remembered and cherished because they are part of your lives.. Thank you :)
Another one would be prayers, some seemingly short prayers could be the most powerful ones . So seriously, prayers of a significant size in terms of length does not matter.
The last one would be encouragements i guess. Even simple words like " you look great " could really boost up someone else's self esteem etc etc.
The most amazing thing is that, gifts costs you little , while encouragements and prayers costs you nothing and you can input in someone else's life significantly !