No, they're pretty sophisticated now.
EFP, Explosively Formed Penetrator, as used in Iraq IEDs
The charges are generally cylindrical, fabricated from commonly available metal pipe, with the forward end closed by a concave copper or steel disk-shaped liner to create a shaped charge. Explosive is loaded behind the metal liner to fill the pipe. Upon detonation, the explosive projects the liner to form a projectile at a speed well over 1 km/s, depending on the design and type of explosive used.
Because they use explosives to form a molten (technically, a super-plastically formed, but still solid) copper penetrator, instead of using an explosive blast or solid metal penetrator, these charges are extremely dangerous, even to the new generation of MRAPs (which are made to withstand an anti-tank mine), and many tanks.[7]
Often mounted on crash barriers at window level, they are placed along roadsides at choke points where vehicles must slow down, such as intersections and junctions. This gives the operator time to judge the moment to fire, when the vehicle is moving more slowly.[8]
Detonation is controlled by cable, radio control (RC), or remote arming with passive IR (PIR) trigger. EFPs can be deployed singly, in pairs, or in arrays, depending on the tactical situation.
The most recent innovation (after the arrival of shaped charges) gaining popularity are infrared triggers for IEDs (improvised explosive devices). These triggers are a conversion of the simple "light" beams used in burglar alarms (see image) and as safety mechanisms on garage doors. The beams are activated remotely by radio controls when a patrol approaches. When the light beam is crossed the bomb goes off. Unfortunately, unlike radio controls the beams are not easily jammed. These new triggers have been used in numerous deadly attacks on British forces over the last several months.
Improvised Explosive Device in Iraq. The concave copper shape on top is an explosively formed penetrator.
The one thing they have more access to there than they would here, as mentioned, is explosive materials. They can just disassemble old artillery shells. They would need precursor chemicals here, but the tech itself could be obtained in any Home Depot and Radio Shack.
Here, you know more than me about the subject of how insurgents rig their bombs.
I just consider it a good survival trait in this day and age to keep brushed up on knowledge of What Might Really Be a Bomb. Unlike the City of Boston.
So far, the only things people have done in the US have pretty much been large fertilizer/fuel oil truck bombs, pipe bombs with not much yield, and a steel ammo can filled with black powder in Times Square in front of a recruiting station. Small, powerful bombs require military explosives, very unstable explosives (TATP) or things that raise red flags when someone buys all the precursor chemicals. Some damn fools will pick up a two-capped piece of large PVC lying somewhere, and I want to be sure I'm already going the other way instead!
Though the "shoe bomber", coming through the UK, had the shoes filled with PETN, pentaerythritol tetranitrate...I'm not sure if they ever found out where he got it? Semtex (PETN and RDX) in a small radio brought down the Pan Am flight over Lockerbie.