Project Linus is a great resource. Also, remember that most any block can be up-sized. Quilterscache is another great resource. Pre-cut kits with VERY clear instructions are good to have on hand. Accurate cutting is just as important as accurate sewing. Blocks sewn by only one person are usually easier to put together than blocks sewn by a group.
When a top is handed in, seams should be checked and any oopsies fixed or returned to the maker for fixing. Also check the stitch size and tension. We have had tops with seams that literally unravel before our eyes. Bigger stitches might be easier to unstitch but they do not make a durable product.
Any star block alternated with 9 patch blocks make a quick and fancy looking Irish Chain.
Alternate 9 patches with Pinwheel blocks to get a pattern that looks super difficult. Added bonus--you have fewer seams to match.