Here is one of my most effective Czech nymph patterns this last season. These are quick easy ties, a little sloppy but the fish don't mind. You can turn out a couple dozen in no time at all. The key to tying an effective Czech or Polish style nymph is turning out a fly with a good amount of weight and a thin profile. I will weight these patterns with adhesive backed lead tape or square lead wire. Both methods will allow you to load a hook with more weight than traditional lead wire. Some flies have a single layer of lead some a double. Its pretty easy to figure out which is which by just holding them in your hand.
This pattern is a basic olive Czech Nymph.
Hook: Partridge CZ #12
Shell back: Tan Shrimp Foil
Inner Ribbing: Gold Wire
Outer Ribbing: Mono
Abdomen: Synthetic Light Olive Dubbing
Heart/Spot: Clear UV Dubbing
Thorax: Brown Hares Mask