Designs for Coloring: Flowers Paperback - 1990

She then began work on a collection of six books, the How To Hide series on camouflage and the magic of this phenomenon in nature, which covered the entire animal kingdom -- insects, birds, mammals, amphibians, reptiles, and sea creatures. The next collection of books became a five-volume series on parts of speech: A Cache of Jewels and Other Collective Nouns; Kites Sail High: A Book About Verbs; Many Luscious Lollipops: A Book About Adjectives; Merry-Go-Round: A Book About Nouns; and Up, Up and Away: A Book About Adverbs. She also wrote and illustrated the unique and fascinating book Color, a charming and instructive guide to how art goes through the four color printing process.

Among the notable people who have had an influence on Heller's writing have been: Ogden Nash, Gilbert and Sullivan, Edward Lear, Hilaire Belloc, and Dr. Seuss. Heller says of her work, "All my books are nonfiction picture books in rhyme. I find writing in rhyme enjoyable and challenging, and I think it is an easy way for children to learn new facts and acquire a sophisticated vocabulary. Children are not intimidated by big words. I try to make my writing succinct and allow the illustrations to convey as much information as possible."