there are quite a few guys over at crappie.com building cover out of bamboo, if you browse or search this forum it'll give you more examples

http://www.crappie.com/crappie/crappie-cover-lake-structure-and-pond-mgmt/

Mat Peirce
1.25 acre southeast Iowa pond
LMB, BG, YP, WE, HSB, RES, BCP