User blog comment:Mythical zoan fruit enthusiast/For those who want Luffy to have Mera Mera and Gomu Gomu/@comment-9159451-20130507214405

Goro Goro no Mi + Pika Pika no Mi would be pretty awesome stuff.

Not really a combo, but giving Laboon Hito Hito no Mi would be interesting, to say the least.

Gasu Gasu no Mi + Mera Mera no Mi

Gomu Gomu no Mi + Bara Bara no Mi

Bomu Bomu no Mi + Horo Horo no Mi Ghost bombs anyone?

Bane Bane no Mi + Kiro Kiro no Mi

Toge Toge no Mi + Jozu's devil fruit

Doku Doku no Mi + Hana Hana no Mi