I find that coming up with ideas of things to draw isn't always easy. Making time to draw isn't always easy either, especially when taking care of kids. This idea combines fun drawing time and fun kid time.
I wrote a bunch of adjectives and nouns on little slips of paper and put the adjectives in one bag and the nouns in another. The adjectives were things like curvy, wide, tangled, small, large, etc, and the nouns were things that could be incorporated into a creature like head, eyes, fins, tail, articles of clothing, etc. Then we drew random combinations of these words to get ideas for our drawings. We also added a third bag to the mix with random objects in it that could be included (skateboard, backpack, piece of toast...)
This is what my daughter and I came up with. My words are below my drawing. Her words were: scraggly mustache, only one eyebrow, green hooves, noodles, roller skates, and clothing.