I use several different ways:
group according to : month of birthday e.g all January birthdays go together
: day of month of birthday eg, 1st, 2nd, 3rd
: colours they are wearing
: type of shoes
: favourite colour, music, band, etc
: different coloured worksheets so pink work together, green and so on
: hair colour, length of hair
: letter of the alphabet that their first name begins with, second name
: age of grandparents, siblings
: number of cousins
: mother �s birthday (month or day not year!), father �s birthday, siblings
There are a myriad of ways once you get into the swing of it.
Just be prepared for a few minutes chaos as they think about the answers and then forget their groups but it is worth it in the end as it is still reinforcing English.
Cheers Joy