Edward Scissorhands would like these – especially after seeing minute 0:50 in the video below.
Japan is of course a place with a strong culture of calligraphy so it’s no surprises that it has given birth to some fantastic innovations in brushes. The Popcorn Yubi Fude is a "finger brush" in a funky yellow design that has proved a huge hit for its makers, selling 6,000 units in its first month of release alone!
You can slip the brush onto your finger tip and then practice your strokes, be that real calligraphy, decoration or just painting in inks. Even better, you can wear multiple brushes on different fingers at the same time and switch brushes easily with differently sized holders.
More info: Popcorn Yubi-fude Finger Brush