Yes, you could make a flytrap from an empty tomato sauce jar or a dish with plastic wrap, but neither of these methods elevates the task of combatting flies in your house. This glass flycatcher, however, does.
Made of handblown glass, the jar is perched on four legs and is available from Swedish shop Artilleriet. Fill it with leftover wine, honey, or anything sweet to attract summer insects (wasps included).
For another fly repelling method, see our post Domestic Science: A Magic Fly Repeller.