This would work for those stupid plastic sprinkler boxes too. | How to cover unsightly septic tank covers.
DIY Planter Boxes-option to cover our ugly septic tank lids
Idea to hide septic covers?
Amazon.com: New Septic Tank Lid Cover - alternative to Fake Rock - Made in the USA: Patio, Lawn & Garden
hiding septic tank covers | SAVE Artificial Rock - Flat Septic Cover
How to install a septic tank riser and new lid yourself - easily!
Septic tank easy access
Simple steps to hide the ugly septic tank in your yard with a fake rock. This works on both the concrete septic risers and the green plastic ones as well.
hiding septic tank covers - Google Search
how I disguised my ugly septic tank cover!! (it's under the bird bath)