Per your requests, here's a tutorial for the voluminous bun I've been turning to lately (to conceal unwashed hair). In this video I share my secrets for extra volume both at the crown of my head and in the bun itself.
1. Velcro bumpit (search for "velcro bump" on eBay. Shipping took a few weeks.)
2. Elastic and bobby pins for flyaways
3. Teasing brush
4. Goody Spin Pin (comes in dark or light)