The tassels in this sample are attached using a contrasting yarn. I initially did this to show the technique during construction but it is a way to add just a bit of colour. Another option could be to make the tassels from coloured yarn / multi coloured yarn. A great way to use up very short bits and bobs of yarn — you know, all those 6″ (15cm) ends that you just can’t throw out because they will come in handy one day!
btw: all of the patterns are now available through Ravelry.