Grid Paint

Grid Paint is an online drawing tool using various types of grids (squared, triangular, hexagonal). Drawing by grids is something like pixel art, but in pixel art you have only square pixels. Here you have also triangular or hexagonal pixels. Moreover, every pixel may be flat or have concave or convex shape like diamond or jewel, which allow you to create peculiar images. You can share your images with friends on Facebook or Google+ or download them in PNG or SVG format. Login into your Google account and begin to paint by clicking "New image" link at the top.

Screenshots from Chrome Web Store