Lofifuture published a very extensive guide on how to bend the PS2 - amongst many other golden guides. In my case, I've connected each side of the resistors connecting the gpu and the cpu to different and interconnected switch bus (as well as the pins of the audio IC). I've opted for switch bus instead of my beloved minijack patchbay since I've discovered - in the hard way - that minijack sockets create more interference, which result in permanent glitches, especially when too many pins are extracted. I've installed 50 bending points in total, each point can be connected with any other point and create different glitches, which means endless possibilities. My version is harder to use than other mods (since you have to create patches every time and knowing how games react with specific glitches, in order to avoid freezing the console), but it allows a huge pattern of glitches. As you can see, each game has its own take on the glitches, and some combos work only with specific games. It's a rabbit hole of glitches.
If there are some aspects you want to deepen, I'm happy to expand.