There is no colour I absolutely hate but obviously there are some that are more 'go to' than others. One thing I found helpful was to make one card that included every single colour of a colour family. It sounds awful but give it a try. My very first swap, I made a 'Bold Brights' card and there were 12 colours in each family then!!! My least favourite colour family was BB at the time! It does help get you over the 'don't like/absolutely hate' colour aversion. BY the way you don't need to use every colour cardstock, use the markers or crayons for introducing the actual colour.
Word for January 2014 : Hope