So, as title says, can anyone give me some "ideas" on how I can clumsy/accidentally get myself covered in paint while im painting my room? Must look like an accident, I need as many ideas as possible, something that won't hurt as well, like "falling down the ladder"

Hiya - balance the paint on the top of the ladder and let it fall forwards onto you. Or you could trip and fall into the roller tray, or stand in the roller tray or be holding the roller tray and let it lip forwards to cover you. The handle could come off of the paint pot and tip over you? Love to see the results!

Bearing in mind that paint in the can is super heavy your only option is the roller tray. Even that will be a bit heavy and do you some damage if it physically falls on you while full of paint so the tray needs to be above you but secure so you either need to be holding it or have it secured in some fashion. As securing it and having it look like an accident don't go well together you'll need to be holding it.
I'd say best bet is to take the roller tray to the top of the ladder with a dry roller balanced on it, "drop" the roller, begin to climb back down the ladder with the full try above you and "snag" the back of the tray on the steps of the ladder as you climb down with the paint all at your end thus forcing your hands to tip the paint over you from above.

On The Facts of Life, Jo put a paint tray on a chair. Blair sat on the chair without noticing it. It was perfect. Check out the paint fight scene on you tube. I think this is also the ideal way to start an accident that leads to a pie fight and thus I've paid for pie fight customs (with Jayce) to be done this way.

Stand on a ladder with paint tray in your hands pretend to loose grip of it and tip it towards yourself messing all down your front. Step off ladder right into a bucket of paint.

I have done this in real life - painting a friend's apartment I was moving the ladder with the tray on top. I'd done this for years. This time, it got me.

One piece of advice. Select your colors carefully. If you pick too many inevitably you'll end up with a dull gray.

Have paint can on the paint shelf atop the ladder. Tip paint can over so that paint is dribbling out but paint can doesn't fall. Slip on the paint which has fallen on the floor (presumably on polyethylene sheet. Sit in the paint and under the paint which continues to dribble down.

Thank you all of the suggestion, now I know how to make an "accident" on purpose, I probably would have done it either way as I am clumsy, but at least now I have some ideas, planning on using pink and black paint

Much less involved, but my mind went back to an early MessyGirl video. Liz wiped her forehead as if for sweat, got paint on it in the process, and immediately went all-in with painting herself rather than the wall, lol.