Combustible lemons.

I'm thinking something along those lines, but not exactly along those lines.

Penguins of Madagascar!

EDIT: Or quicklime.

Well, you already have Penguins of Madagascar, so wouldn't I just be taking your theme?

And plus, quicklime's too obscure.

Maybe something abstract?

Abstract? Space?

Or maybe you could go back to purple.

Naw, something new. And by abstract I mean emotion or thoughts. Stuff like that.