vibrant pattern of hand-drawn colorful hearts in red, orange, blue, and white

calligraphy graffiti symmetry pattern cartoon drawing design poster circle flower sketch brand font line text art red love hearts hand-drawn colorful design romantic black background vibrant pattern typography love art romantic decor valentine's day heart bold letters cute artistic playful modern expression theme abstract wallpaper charming gift celebration cheerful valentine graphic doodles message joyful decorative fun artwork