I've always wanted to use flash bulbs on my Canon EF & AE-1P, or any of my cameras for that matter.
Some have doubted whether they made a purpose-built device for this, but indeed they did and it's called the Canon V3. I've included a picture. (Butkus site, Canon EF, Pt. 2, Pages 6-7)
I'd also be open to any other cold/hot shoe mounted flash guns (if a cold shoe, it obviously needs a PC connector). Whaddya got? Make me an offer