What are the best and prettiest plants to plant in full shade?

I LIVE IN MARYLAND- AND I LOVE LOVE LOVE FLOWERS! THE COLORS MAKE EVERY DAY HAPPIER. THE PROBLEM I FACE IS MY HOUSE IS SURROUNDED BY TREES THUS MAKING MY YARD A "FULL SHADE " ZONE. MY FLOWERS GET MAYBE 2 HOURS OF SUNLIGHT A DAY. CAN ANYONE SUGGEST FLOWERS THAT I CAN PLANT ?
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