I have a big white poster, any ideas how to decorate it?

so i have a poster board its 30 in x 20 in. I wanna decorate it somehow but i dont know how to really. im pretty artistic, with drawing and stuff like that i already have a cool collage with stuff from cool magazines. so i know i dont want any collages, anyone have any ideas or cool pictures i could draw or... show more so i have a poster board its 30 in x 20 in. I wanna decorate it somehow but i dont know how to really. im pretty artistic, with drawing and stuff like that i already have a cool collage with stuff from cool magazines. so i know i dont want any collages, anyone have any ideas or cool pictures i could draw or something like that?! oh, and if it helps im a 14 year old girl and my room has lots of pinks and greens in it
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