I usually decorate mine at values or mods. I haven't used clings, I have used tape and fishing wire (very little tape), but my current theme is pins and tags hung on ribbons that I have attached to suction cup hooks (Walmart super cheap). The suction cups work really well and as long as you get decent ones they will stick well and hold up a good amount of weight. I also usually have some small character plushes (either minis or TsumTsums) sitting in the window.
The only trouble I've had was in January this year. It was super cold and the room was warm (I decided later that the thermostat must have been stuck because I don't keep it particularly hot but it was blowing warm almost non stop and the unit is right there beneath the window) and I got a ton of condensation on the window and one hook slid down. Oh and my Tsum Tsums sitting on the ledge got damp. So if you're going in a colder month and you like your room warm be aware of the window being wet.
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