Can anyone say Psychedelic? Spencer Gifts stores are known far and wide for their groovy selection of "blacklight" posters and ultraviolet ("black") lights.
Poster 1 from http://www.posters2prints.com/love-black-light-poster-pr-16213.html
Poster 2 from http://sunshinedaydream.biz
Poster 3 from http://www.visualtransformation.com
Poster 4 from http://www.thefind.com

In addition to strobe lights, light boxes and blacklights, the store also carries the latest lava lamps.
Photo from Wikipedia / "NovemberChild"