I had a cheap silicone dildo with a suction cup that I ended up using stuck to a chair, because I too realized that it was hard to find a surface it would stick to at a pleasant angle. It sits at the bottom of my toy box, waiting for me to do something hilarious with it.
It might not be so good for sex, but think of all the places you COULD stick the thing for much hilarity! I've considered using it as a hat or coat rack, but I suspect that I will place it strategically on a large bus stop ad or some similarly hilarious public place, take a picture, and run like hell. I know where there's a photograph of a Chipotle burrito that could use some spicing up. Decorate a friend's car! or an enemy's! The possibilities are endless!