Hey there,
Oh I loved doing the class-yes in Spanish this past year with my kinders! We although I couldn't do the classity classity stuff and word play I could change the tone of the clase-Si and the number of times...clase, clase, clase--Si Si Si! Get it? I also used some other Spanish words to do opposites...like if I said a word in Spanish and we were working on opposites, they would say the opposite word in Spanish back...for example,
Teacher: caliente,caliente
Class: frío, frío
This was so much fun! I can only imagine the use of class-yes to review core concepts in Spanish!

You could also say something in English/Spanish and have them repeat in the opposite language!
HTH
Farrah Shipley
WBT Kinder
Co-Director WBT Model Classrooms