I'm looking to put some home-brew invocations on my warlock, but I can't seem to find anywhere to do this. I have looked through the forums for a while and haven't found anything helpful related to this topic. Is there anyway to add in invocations? Or at least a work around for now?

You can't currently homebrew base class features, which includes Eldritch Invocations

Quote from pelefiggens >>

I'm looking to put some home-brew invocations on my warlock, but I can't seem to find anywhere to do this. I have looked through the forums for a while and haven't found anything helpful related to this topic. Is there anyway to add in invocations? Or at least a work around for now?

The best work around I can think of right now is to add in a homebrew Feat instead of selecting an Invocation.

Say for example you want a homebrew Invocation that allows you to cast Magic Missile at will. I would just create that as Feat instead, and call it "Invocation: Magic Missile" or something to remind yourself that the Feat is meant to replace one of your Invocations. On the Invocation part of your character builder, just remember to make sure one of the Invocation slots should be blank.