I've no idea what they are called but they look cool and no doubt deserve to be fished by someone that knows what they are doing, but it's worth a try. Over the last few months my grand total of 6 fish have mostly be caught on a silicon lure. This bad boy caught 5 fish and I've used it in two ways. The first, which to be fair is the simplist and probably the laziest way to fly fish involves casting it down stream in one of the local streams and simply playing it up, down and across the flow. This has proved fantastically effective and is great when your learning as your casting skills are not so important. The second method is casting out across the stream and gradually pulling in the lure until it's come back to my side of the river then casting it out across again. This caught my biggest fish and the only one that was worth keeping. I was casting it just above a tree branch that was slightly submerged in the water, it got a few bites until success and a good size trout was landed. This lure is pictured below.
I imagine I shall use this one again in the spring when the whitebait are around as it's a great wee lure and is good fun playing it in the flow. I had 4 of these initially but due to some shameful casting am now down to the last one. Next time I'm near the shop that stocks them I shall get a few more.