Looking for 2 story curtains/drapes?
IKEA has curtains that are 118 inches long, but that probably won't be long enough. If you know someone who sews, you could always sew two curtains together to make them long enough. Otherwise, you'll probably need to find a window treatment business...
Oversized Foyer Window Treatment?
I would use PVC pipe for a curtain rod, and make the curtains to fit just the window itself. If it is possible to use a tension rod you could do that. If it is a really big window how about a shower tension rod and paint it what ever color you want .
Does static cling window tint actually work, and for how long?
Yes. I got some for my house, put it in the kitchen window, in the bathroom window, and have had good luck with them. The kitchen window ones look like stained glass. Love them. The bathroom window ones look like the opaque glass. I live in the south...