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I've gone to a similar site, isketch.net for awhile (warning: loud music on pageload), but it's full of teenagers. I frequently have to draw a lawn with a fence around it.
The highlight for me was drawing a surprised-looking Admiral Ackbar (replete with x-wings in the background in case you didn't recognise him) to illustrate "trap". It was worth the effect, even though no one got it in time.