Natural ground blinds rock !!
Usually everything you need to make one is right there . A nat ground blind can be anything from hiding behind a tree to constructing a fort your kids would be proud of . Depending on the terrain you can:
1) Make a teepee of leafy sticks
2) Attach leafy sticks to your clothes for a " walking blind"
3) Duck behind fallen logs
4) Hide behind big rocks
5) Bundle some long grasses to hide at a field edge

The list is limited only by your imagination and ingenuity , and the materials at hand .
Good luck !