These thematic pictures of Χρώματα και σχήματα are analogous to a visual dictionary. The theme "Χρώματα και σχήματα" splits into several parts. For children, especially toddlers from 1 to 5 years old, it is better to divide the sets of cards over several days, or even weeks, so the information is absorbed better. Especially it is true if you are using flashcards to learn the greek language, which is not your native language.
To expand your greek language vocabulary on the "Χρώματα και σχήματα" topic, flashcards games are the best way: