We have had good luck with using the Creative Grids Pineapple ruler in groups with multiple participants of various skill levels.
We all cut strips from our stashes in the suggested dimensions and cut enough to trade with group members. Because you are all using the ruler the finished blocks are the same size so you can even trade blocks with each other and not have to worry about inconsistent block sizes. The tutorial by JeanAnn Wright (the creator of the ruler) is really good - but the Missouri Star Quilt Company also has a good tutorial.