I think that the GHR is a very underrated exercise. Here's a video showing three variations:
Now you might be thinking that it is not a bodyweight exercise because it is on a machine and he is using weights. Well the machine is not necessary and neither are the weights. Difficulty may be increased by extending the arms from the body, or beyond that by doing single leg variations. Those without access to the machine can improvise. I could prescribe a specific settup but then you might not have the necessary implements to make that work either. So let me tell you at a conceptual level what is necessary to settup an improvised GHR:
1) something to pad the knees and shins, so the weight is distributed evenly along the lower leg as you do not want all of your weight on your knee caps.
2) a wedge that you can press the soles of your feet against and that anchors your heel or ankle from above (this can be a person sitting on your legs if nothing else is available.
Hopefully I would like to get some pictures of improvised settups that have worked well for me to give you guys some ideas. Rick suggested we buy the domain ghettoglutehamraise.com that would focus on these makeshift devices.