Cool ideas for decorating my room?

i share a small room(apartment) with my little sister and she doesn't care much about our room but i think our room is so so plan. i have like two posters up on the walls and that's it. my room is small and i want it still to look cool any cheep ideas?by the way, I'm 15 and i like really bright neon colors show more i share a small room(apartment) with my little sister and she doesn't care much about our room but i think our room is so so plan. i have like two posters up on the walls and that's it. my room is small and i want it still to look cool any cheep ideas?by the way, I'm 15 and i like really bright neon colors
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