u can try dum charades, passing the parcel, karaoke, singing a song with same lyrics in different tunes, fancy dress competition, memory games (like showing some things for abt 10 sec n then ask the ppl to write what al they remember.. max correct entries win.), treasure hunt, puzzles, quiz, games with balloons like who inflates max or deflates max... workstation decoration competition, dress themes on specific days..outdoor games like relays with different material, volley ball etc..