While some regs are confusing, use of blinds doesn't seem to be one of them. Pilingupnaturally-occuring stuffto make a blind is illegal. Using naturally-formed materials like snags or low-hanging limbs isn't, IF you don't augment them by arranging suchthings to suit your purposes.

Aman-made blindmust be made of listed materials (cotton, nylon, canvasplastic, plywood,etc are man-made materials). Blind mustcompletely enclose the hunter on all four sides and from above to block the detection of movement within the blind. When FO is required at a stationary calling location, at least 100 sq.inches of FO must be displayed outside the blind, within 15' andvisible 360 degrees...go to FO requirements on the same page (36),for a reiteration of the turkeyFO regs.

P. 32: Blinds can be used for big game (see turkey section fo specifics for blinds used while turkey hunting), however the required amount of FO must be worn while in the blind. Although not required, it is suggested that some FO be displayed outside the blind. The turkey requirements are the ones on P. 36.