Depending in what you like, something we did was use invisible uv pens and drew on the walls, it's loads of fun and you can't see it unless the lights are on, it's not for everyone but I like the neon punk vibe of crude drawings like it was a concert hall. They do eventually go away tho. https://www.amazon.com/dp/B09FSQHP9F/ref=cm_sw_r_apan_glt_fabc_RGHP26M04G2EPZBZN8JS?_encoding=UTF8&psc=1