Toddlers love animals, having them act out their favorite ones, is a great beginning to developing imagination and introducing dramatic play. Save Halloween costumes, or make simple animal costumes from year to year to add emphasis.
Since even the one year olds are watching our every day activities closely, give them the opportunity to mimic us. Provide play dishes and food so they can serve dinner and tea, provide envelopes and card board rectangles so they can deliver mail into slots, or turn it into money for their purses, money that can go into cardboard registers, give them older radios so they can turn the dials and press the tape player buttons (but watch for knobs that might fall off). Any other object with lots of buttons (like an old type-writer) is a gem a feather duster, or a clean "rag" will set a toddler for a long time.
A fun way to spruce up your kitchen area as well as to promote imaginative play is to contact pictures of food on your plates pans etc. This really encourages language development and is a good way to promote diversity in your classroom as you can use a wide variety of foods.
My ones love to give their babies a bath and do dishes like Mommy in our sensory table!