Another speech bubbles.
These are 40 .gbr (Gimp) brushes in RGB mode and with transparent background (this means you can't choose their color, they'll be always black and white). Size: 450-550 px in diameter or height. Tested in GIMP 2.6.5.
Please credit me if you modified these brushes and then shared them.
IMAGE PACK (just images, not brushes) is available here: [link]