Rocky: I never tried the blue ones. Like they say, "When you try black you'll never go back," and those black plastic drip irrigation lines from The Home Depot's plumbing department seemed to solve my problem. I also use rubber automotive grommets to tightly seal off the hoses through the holes. A friend of mine who's too damn cheap and lazy to make a neat installation uses black silicone glue from the 99 cents store to seal his lines, but like everything else he does it looks half assed. As far as the blue hoses are concerned, as long as they're thicker than the clear ones, and not as likely to kink, I guess that's okay. But I won't give you my stamp of approval if any light gets in there.
Black plastic trash bags? I suppose that would work as long as they're thick enough and you don't get any light in through the folds. Eventually you'll probably come around to the black plastic buckets like the rest of us. I've tried stuff like that, I think we all have, but eventually I got tired screwing around with the additional problems they created. I try to make sure that everything I use in my grow is 'food grade' because eventually I'm going to ingest it. You might want to RTFB's and see what others are doing before you start growing. That might save you a lot of headaches in the future. Originality is great but a lot can be said for first knowing what your peers are doing and then striking out on your own with something totally different. I hope that helps. HSA