When I was a kid my uncle gave me a set of these blocks with illustrated images of rural Germany. I always thought they were the coolest puzzle and kept them in good condition. While browsing craft books at a local thrift shop I came across a craft book from the 70's with instructions on how to make a set and had to try it out.
It wasn't difficult, plus it gave me a reason to recycle a few pages from a magazine. (I am all about reusing and recycling). With six different images I was able to vary the difficulty so it is really a good puzzle for any age.