I love making BIG bows.
I just made this one last night to match my daughter's shirt.
Not sure if it's what you are looking for, but if it is, here's how it's made:
Two spikes of 1.5" ribbon, approx 6"
Approx 5.5" boutique bow of 1.5" ribbon
Silver metallic loops around a white 4" bow, 1.5" ribbon (flat, not poofy)
4" boutique bow of 7/8" ribbon
A little bling a the center
My daughter is four, and you can see it on her in the last pic, it's BIG