I've heard a lot of people suggesting finding a feminine timbre in falsetto, then lowering the pitch until you cross back into your modal register. the idea is you keep the same shape in your modal voice that you had in falsetto.
I recently came across a great technique that works wonders for me, by just adding one element to the technique above. When I lower my falsetto all the way, I start whispering in my girly-sounding falsetto, and without stopping I switch into my regular register, all the while keeping the same voicebox shape. The whispering really helps cross over the passagio. Hope that helps!