Or a coffee filter.
Which flash did you get? Or did I miss where you posted that?
I use my SB400 a lot because my SB600 is heavier and takes more batteries.
I don't use a diffuser with my SB400.
I just flip the flash head up and bounce off the ceiling.
That's what I do with 99% of my photographs.
But if I'm further away from my subject, I might flip the flash head forward a tad.
Congrats!!!
I use my flash with all of my indoor shots.