Not sure about house geckos in particular, but all my fish and reptiles have always loved earthworms. If you're crafty, you can set up a box outside to raise earthworms. It takes barely any effort to maintain and doesnt smell bad. Just google "how to raise earthworms" or something similar.
I think feeding earthworms every now and then couldn't hurt but just keep in mind that house geckos are arboreal creatures and insects should make up the main part of their diets.
If you live in an are where pesticides are seldom used you can collect insects outside. Most lizards enjoy drab-colored moths, flies, lacewings, tree crickets, and so on. Security lights attract tons of bugs at night; just use a fine net and a jar to scoop up as many as you need.
Even if the bugs don't have chemicals on them couldn't they have parasites and then transfer them to my geckos?I have been feeding crickets for a couple weeks now but i can't get the crickets to stay alive for more than a a couple days.Anyone have thoughts on housing crickets?i have been keeping them in a tote with handles,toilet paper rolls and a couple cardboard pieces and they still die.
RE: parasites, I trust wild bugs a lot more than I do petstore crickets; same goes for fish. Just because it's from the store doesn't mean it's clean. Store-bought feeders are frequently diseased and almost always malnourished.
RE: keeping crickets alive, you need to provide moisture at a minimum. Crickets don't deal well with open water (they're prone to drowning), but you can offer slices of potato or apple, or the gelatinous 'cricket quencher' type products to keep them alive. It's also a good idea to feed them an enriched diet, such as fortified whole-grain cereal or commercial cricket chow, before offering them to your lizard; this way you get the nutrients in the cricket chow into your lizard's diet.