decorate my computer room

I can play around in this room, make it cool looking. I want it to be like a hobby to me. Find things in threft stores, find things i like and i see as art. And put stuff up places. Im gonna have pictures, from paintings to posters. Cool curtains, cool things i find in threft stores, shelves,lamps, black light…any ideas…let me know. Im not looking to buy stuff from spencers or places like that. I want it to be unique and I dont want to spend much…