Get your dancers improvising! Think of a rule, game or set of instructions - such as, they always have to have both feet and one hand on the ground - and get them working around those rules, seeing how far they can push the rules. Either that or find some music and see how the dancers react naturally to the music.
what helps me is to turn on different types of music and improv by myself, you can get very unique stuff that way. good luck, I'm sure you'll do great! =D
i am the dance captin for ucla dance team and i have to make dances everyday so i just turn music on and start dancing and whatever looks good i keep! and then i keep going till i complete the dance its very fun! and it ususally turns out good! well obviously it does we have won every dance compition already so it must be good! well good luck