system
A chat on subreddit /r/pcmasterrace
human
I saw someone use... 

1. Legos
2. Spiderman action figure
3. Jenga blocks
4. Toliet paper roll (carboard tube)

I think you'll be fine as long as you don't hit a fan or it touches anything eletrical. I wouldn't keep that as a permament solution though. GPU sag protection devices are as cheap as you want them to be but if you value your GPU -- get a real one that is built to support it.
gpt
5. Bottle o' nail polish 💅