Got any tips for a holga camera virgin?

I just got given a Holga Camera and I love it. But unless I use it lots and use it well the gift giver will take it back :P I’ve already had trouble loading the film (gen Y- sorry!) but I think I’ve figured it out now. I’ve read up on multiple exposure and stuff like that, and I have a special colour flash setting thingo, but I was wondering if anyone with experience with this type of camera could help me out with a few tips and perhaps some cool experiments to try!
Thanks :)