Since Banksy has been doing his thing for just under 20 years, it's high time architects got in on the act. And so I submit to you, that if Banksy can stencil a building, so can we!
First, do yourself a quicky render, keep the shadows to a minimum using the patented Buildz Middle O' The Night Render. I like to speed the whole process up for this technique by setting the quality of rendering in Revit to Draft, copy the settings to custom, then crank up antialiasing to 6. Fast and textured, but with some volume, kind of like a good cheap haircut.
Now, download and install Inkscape, "An Open Source vector graphics editor, with capabilities similar to Illustrator". This application is fabulous, and a handy tool to have for anyone messing around in the visual businesses. And it's free. Open your exported render in Inkscape, select the image and go to Path>Trace Bitmap. In this dialogue, you will be presented with a number of options to create vector artwork from your render, but Brightness Cutoff is the fastest path to Banksydom.
Play around with different setting for variations, you can get the idea pretty quick.