Yep. Two of them are voronoi cells actually, generated from procedural textures inside 3dsmax. I used the "Advanced Noise" procedural texture plugin, then generated a tile-able texture map from that.
All done with standard modeling tools in Max. I used the cloth modifier to literally "inflate" the model, as if it were a balloon pumped full of air. It's an interesting technique I learned in our advanced modeling class last year. First time using it this way. Took a few local simulations to get the result I wanted, but worked nicely. Then I just used some of the standard edit poly tools in the Graphite ribbon for the rest.