I have a bunch of unclaimed games from previous humble bundles. These are okay for giveaways right?

Sure, if those games were not given out for free after bundled. :D

Yep, it's fine. :)

If it fits, it ships.
If you can (in fact) create a giveaway for those keys, why not?

Yep, keys are a-okay as long as they are for Steam.

The GA key handler even accommodates Humble links (not IG links though) :-\

Okay great, thank you for replying!

If you can select them when making a giveaway, they should okay.

It is fine, quite common, and still very appreciated!

Just note that the "CV" calculation which determines your Steamgifts level gives only 15% credit for titles which have been bundled or discounted by 95% or more. A full list is here: http://www.steamgifts.com/bundle-games

As long as it's redeemable on Steam and it's in the giveaway list, it's fine.

Even if they are "gift links"?

Awesome thanks a bunch!