[quote author= NintendoLife]
Popular message-swapper Nintendo Letter Box got an update today that lets you write and draw with coloured ink.
Simply scan the QR code below with your 3DS console and it'll take you straight to the update, which adds five coloured inks to the free application: red, blue, green, purple and orange. Black remains an option too.
To scan the QR code below:
Hold L or R on the 3DS Home Menu to bring up the camera.
Tap the chequerboard option — this opens up the QR reader.
Align the frame with the QR code and it will offer you a link.
Press A.
To select the new colours tap left or right on the D-Pad. Note that you can only use one coloured ink per letter, so you can't draw multi-coloured masterpieces.
This update is now available around the world.[/quote]
Source
Swapnote has been updated today, now with different colored ink!
All you need to do is scan the QR code from this source, or check the update list in the eShop. Enjoy!