crel for creating namespaced elements, like SVG.
Same as crel, but with the namespace as the first argument:
crelns('http://www.w3.org/2000/svg', 'g', {'class':'thing'});
You can easily make an SVG specific version like so:
var crsvg = require('crelns').bind(null, 'http://www.w3.org/2000/svg');