Don't think you're high anymore, but for the next time:
Might sound cliché, but videos with patterns and colors. Especially trippy music videos. Anything that's already fun to you sober. Drawing or anything creative, even if you believe you suck at it.
Music is a big one too, it can shift your mood in crazy ways. Also nature. Nature has a lot of interesting patterns and shapes and also vibrant colors. I know you said you are stuck in your room, pretty nature & animal documentaries would probably do the trick as well.
For next time, try to make a list of some cool things you could do. Don't stick to it too much, get creative and find your own great stuff to do.