Copy and pasting multiple keyframes?

I've got a series of Julia seed values that I've carefully keyframed, and now I want these keyframes to repeat because the first/last keyframes are the same and it will loop. I'm trying to find an easy way to copy this set of keyframes and paste over and over adding more keyframes... Can someone help? Thanks! I tried doing it in the timeline editor but couldn't get it to work...

Unfortunately you can only copy and paste individual keys, or all the keys for the entire animated range of a parameter. So there's no easy way to duplicate a range of keys.