They're actually quite easy, just a bit time consuming.....if you buy the fake pumpkins at like Michael's (use a coupon)....and a small dremel set, you can get the pattern from the web. Trace the pattern using the poker around the outline....and then cut it out.....when you're finished, measure a hole on the bottom for a light (I get the battery operated lights that are like under cabinet lights from Walgreen's....use it to measure the hole....then cut it.....take it outside and clean out the inside with air and a moist towel to get the particles left inside, out of the pumpkin. Then insert the light into the hole at the bottom and turn it on.
Alternatively, if you want string lights in there, then cut a SMALL (no larger than 1" hole in the back (off center so it's not clearly visible, and feed the string in...the hole allows the plug to remain outside so you can plug it in.
We make a different pumpkin every year with this method. We have lots of villains (my fave)....but you can do any of them that you can find a pattern for.
Hope that helps!!