Ok, I haven't shot film in about 5 years, but here's my 2 bits...first, try all of the above...you're experimenting...
Second, a "good" image depends upon proper exposure...so throw the meter out the window...with negative (Print) film, an over exposed image can be printed down to normal, but the side effect is a grainy image with hard to control colors and contrast...the grain effect is true with B&W or Color.
An underexposed negative will give you a soft, pastel look when printed to normal...kind of milky looking...
The suggestion of out dated film is a good one, but most likely, that film is still fine, but really cheap!
Go nuts! Damage your film! Leave some rolls in your back window of the car on a hot day (But NEVER your camera!)....Heat creates fog on film, which leaves wierd colors, makes grain, and generally screws up film...Run it though an X-Ray machine! Scratch your film before printing! Dig the baffle out of the film canister! Open the back of your camera really quickly under good light..
If you have a filter, try it. Try different colors. Spit on your filter. get it dirty. Put a light coat of vaseline on it...we used to crumple up cigarette wrapers and put them over the lens...
Take off the lens and put foil over the opening of the camera body..poke a pin hole in the middle. Take pictures out in the sun at various shutterspeeds.
There is a plastic camera called a Diana..it has a plastic lens so it's fuzzy, and the body usually leaks light, and there is very little exposure control...it's HARD to get a good picture!
There's a russian camera called a HOLGA that is medium format, but is a piece of crap. Both can be found on ebay cheap.
For a little extra money, there's a thing called a "Lens Baby" that also takes intentionally fuzzy pictures. I have one, it's fun!
You have a great old camera, but the fact is, now that the world is digital, any film camera is practically worthless (moneywise), and for what you want to do, a broken camera may only enhance your effect, so I say put some bad film in it, go out and play, and see what you get!