
Another great tip I came across recently was sewing all 4 sides of the square and then cutting across the middle in both directions yields 4 HST units and you didn't have to do any marking the middles. (be sure to starch your fabrics or it can get stretchy)
Here is a size chart when using this method
Pretty examples for some inspiration -- Images and Links can be found here, all images below are from Pinterest.
Hope everyone is inspired and feels eager to give some of these ideas a try, either for themselves or as part of a charity quilt.