A chicken wire cage might be a good start. Bend it into the shape you want, then cover the whole cage with a dark green/tangela colors fabric and then make the vines/tubes out of the same fabric and fill the vines/tubes stuffing. Attach the vines/tubes. to the base by sewing the vines in various positons crossing them over each other. Where you want the face to be use black mesh material so you can see and white mesh for the eyes. Make sure you leave arm holes and leg holes so you cna move around in it. ^-^
Hope this helps.
Welcomed my new muse to the world on Jan 3rd 2014 at 3:18am.
From now on I believe all of my cosplays will involve this little wonder that I helped create.