Many times I’ve dreamed about a device similar to this one, now it’s here 🙂
http://www.noteslate.com/
Suminagashi (墨 流 し) or “floating ink” is the process of marbling plain paper with water and ink to transform it into something vibrant and colorful. It originated in Japan as early as the 12th century. Watch the video for more.
http://suminagashi.com/
Some select recent ones, very good.
Also a reference to the site where I discovered him: hyperallergic.com
This is his site: johnholcroft.com
http://artists.pixelovely.com/practice-tools/figure-drawing/
This site seems to have more than this to offer, but I stumbled on it because of this neat feature. It offers a sequence of photos of models to practice figure drawing.
They have timers so that you must draw something in 30 secs or 1.5 minutes. It’s like a free practice class!
They have some good free lessons.
Drawspace is more than just another art website; we are an international community of over 320,000 drawing enthusiasts, professional artists, art educators, and authors of art books. Check out our huge (and continuously growing) library of free, downloadable, high-quality lessons authored by world-renowned artists, art educators, and authors (no registration or log-in needed).
Visit at http://www.drawspace.com/
View on Brain Pickings… or click on the image for the full image.
The article on Brain Pickings has detailed graphics on each paintor.