I think that, rather than suggest a whole album, try linking them to, or get them to hear, individual songs. The songs should be carefully chosen to suit your friend, and let's be honest, Eels have at least one song that everyone will enjoy.
That's what my best friend did when she introduced me to Eels. She gave me "Beautiful Freak" at first, because she thought we could relate to it. She then gave me "Mental" which at first I thought to be too much (I was into 80s songs at the time. yeah, quite a contrast) So she figured I'd enjoy a more upbeat track of theirs "Hey man (Now You're Really Living)". That song, like all the others before it, just felt weird to me. Not in a bad way, I just hadn't heard anything like it before.
Later on, after I matured a bit and faced some hard times, I remembered those songs and I did research on the band and this mysterious "Mr. E" as my best friend likes to call him. I was intrigued by the story behind Electroshock Blues and that became my first purchased album.
I never looked back.
tl;dr: Give your friends appropriate songs rather than albums. You can talk about albums if they're interested.